The Patina Bench

Best Leather Repair Kits for Bags

Six repair products, each matched to one kind of damage a bag actually gets, chosen from listings that say what they are for and ranked with the least drastic fix first. Plus the plain rule for when a kit is the wrong answer.

By Stephen V.Last updated How we pick

Our top pick

Leather Honey Recoloring Balm (Brown)

Leather Honey Recoloring Balm (Brown)

$19.99 · View on Amazon

$29.9933% off

Price as of September 20, 2026. #ad How we’re funded

The most common repair a bag ever needs is not a repair at all in the furniture sense: it is a brown bag scuffed pale at the corners, where the color has worn away and conditioner alone no longer hides it. A recoloring balm is the least drastic thing that fixes that, and this one comes from the brand whose conditioner we recommend most on this site, with a non-toxic, vegetable-based formula, a built-in sponge applicator and a listing that states no color transfer once dry. It comes in one brown, so test it on the base first.

Read the full write-up

Search for a leather repair kit and almost everything that comes back is for a couch. The photos are of car seats and sofa cushions, the boxes hold ten pots of color and a mixing chart, and the word “purse” appears, if at all, at the end of a list of forty other things. That is a problem, because a bag is not a couch. It flexes, it is handled all day, it is made of a small amount of usually finished leather, and the damage it gets is specific: scuffed corners, a faded panel, a painted edge worn rough on the handle, a lining that has let go, and occasionally a real cut. A fourteen-piece couch kit answers none of those well.

So this page is built the other way around. We started from the five kinds of damage a bag gets and found, for each, the product a leather repairer would actually reach for. Then we applied four rules, in this order: the listing has to say what the product is for, in words, so we could record exactly whether bags are named; the least drastic fix ranks first, because a balm you can buff off is safer than a paint you cannot; the brand has to have a track record in leather care or leathercraft, not just a storefront; and every product has to be in stock at a live price on the day we checked.

Every claim below comes from the seller’s own listing, read on September 20, 2026, and every price is pulled live rather than typed in. We have not repaired a bag with these products and we say so wherever it matters; what you get is a careful read of six real listings, honest cons on all of them, and a clear line at the point where a kit stops being the right answer and a professional starts. If your mark is a light scratch, read our scratch-removal guide first. Most of those come out with warmth and conditioner, and nothing on this page is needed.

How this is funded:we earn a commission if you buy through our links, at no extra cost to you. It never changes which product we recommend, and we’ll tell you when we’d skip one. Full disclosure.

Quick picks

Ranked on leather grade, construction, capacity and value. Select a row to jump to the full write-up. We have not wear-tested these bags — here is exactly what we do instead.

#ProductBest forPrice
1
Leather Honey Recoloring Balm (Brown)

Leather Honey Recoloring Balm (Brown)

The color-restoring product from the brand whose conditioner we recommend most on this site, and the one to reach for when a brown bag is scuffed pale at the corners rather than cut. The listing states a vegetable-based, non-toxic formula with no color transfer once dry and a built-in sponge applicator; what it does not say is 'handbag', so spot-test as if it were any other pigment.

Best overall for scuffs and fading
$19.99 · View on Amazon

$29.9933% off

Price as of September 20, 2026. #ad How we’re funded

2
Furniture Clinic Leather Repair Paint, Color and Finish (Dark Brown, 1.7 oz)

Furniture Clinic Leather Repair Paint, Color and Finish (Dark Brown, 1.7 oz)

The only color product on this page whose listing says the word 'handbags', and the right one for the leather most bags are actually made of: sealed, pigmented hide that a balm cannot get into. It is a paint-and-finish in one, applied by brush or sponge, and it behaves like paint, which is both the reason it works on finished leather and the reason to use as little of it as possible.

Best for finished leather
$11.95 · View on Amazon

Price as of September 20, 2026. #ad How we’re funded

3
Furniture Clinic Leather Recoloring Balm (Medium Brown)

Furniture Clinic Leather Recoloring Balm (Medium Brown)

The recoloring balm most people mean when they say 'leather repair balm', from a brand whose own listing sets the one condition that matters for a bag: it works on ABSORBENT leather only. If a drop of water soaks into an unmarked area of your bag, this is the better-graduated color range. If the drop beads, skip to the repair paint below.

Best for shade matching
$24.95 · View on Amazon

Price as of September 20, 2026. #ad How we’re funded

4
Fiebing's Edge Kote (4 oz, Brown)

Fiebing's Edge Kote (4 oz, Brown)

The fix for the most common damage on a well-used handbag, which is not a scratch at all: the painted edge on the handles and strap wearing pale and rough. Fiebing's is the leathercraft-supply name for edge finishing, the listing names purses and bags outright, and a 4 oz bottle will re-edge a bag several times over.

Best for worn edges
$9.99 · View on Amazon

$11.3012% off

Price as of September 20, 2026. #ad How we’re funded

5
Angelus Leather Filler (2 fl oz)

Angelus Leather Filler (2 fl oz)

The honest answer to a mark that catches your fingernail. A balm or a paint hides color loss; only a filler replaces missing material, and this one is from the same American leather-paint company whose suede kit sits in our suede roundup. It dries white and it is a two-stage job by design: fill, then color over it with a paint such as the Furniture Clinic above.

Best for cuts and holes
$13.95 · View on Amazon

Price as of September 20, 2026. #ad How we’re funded

6
Fiebing's Leathercraft Cement (4 oz)

Fiebing's Leathercraft Cement (4 oz)

The adhesive a leather repairer would actually reach for, rather than a super glue. Water-based, non-toxic, non-flammable and clear-drying by its listing, and made for leather-to-leather and leather-to-lining joins, which covers the three glue jobs a bag ever needs: a lifted edge, a peeling lining and a piece of trim that has let go.

Best for lifted lining and trim
$8.54 · View on Amazon

Price as of September 20, 2026. #ad How we’re funded

The picks in full

#1Best overall for scuffs and fading

Leather Honey Recoloring Balm (Brown)

The color-restoring product from the brand whose conditioner we recommend most on this site, and the one to reach for when a brown bag is scuffed pale at the corners rather than cut. The listing states a vegetable-based, non-toxic formula with no color transfer once dry and a built-in sponge applicator; what it does not say is 'handbag', so spot-test as if it were any other pigment.

Strengths

  • Non-toxic, vegetable-based formula, stated free of PFOA 'forever chemicals'
  • Listing states no color transfer to clothing once the balm has dried
  • Built-in sponge applicator, so nothing extra to buy for a small repair
  • Made in the USA by a leather-care brand with a long track record

Trade-offs

  • One shade of brown: the listing offers no light, medium or dark variant, so a tan or cognac bag may end up darker than it started
  • Names couches, auto interiors, shoes, boots and 'accessories', not handbags specifically
  • A pigment balm hides a scuff; it cannot fill a cut, a gouge or a hole
  • Fluid-ounce size is not stated on the listing
TypeRecoloring balm
FormBalm, built-in sponge applicator
SizeNot published
Best forFaded brown leather, Corner and edge scuffs, Sun-lightened panels

Construction note. The listing's own instructions: apply a thin layer, allow it to dry, then gently buff the excess. Do that on the base of the bag first, because this is a color product and there is no 'undo'.

Specs read from the product listing, on September 20, 2026. “Not published” means the brand does not state that figure.

#2Best for finished leather

Furniture Clinic Leather Repair Paint, Color and Finish (Dark Brown, 1.7 oz)

The only color product on this page whose listing says the word 'handbags', and the right one for the leather most bags are actually made of: sealed, pigmented hide that a balm cannot get into. It is a paint-and-finish in one, applied by brush or sponge, and it behaves like paint, which is both the reason it works on finished leather and the reason to use as little of it as possible.

Strengths

  • Listing names sofas, cars, clothing and handbags among the surfaces it repairs
  • Sixteen colors available, the widest range on this page
  • Color and finish in one coat, so no separate topcoat to buy
  • Brush, sponge or spray application, so a corner or a strap edge can be done precisely

Trade-offs

  • It is paint: it sits on the surface and can change the hand and sheen of the leather where applied
  • Listing recommends a full 24-hour cure before use, so the bag is out of service for a day
  • 1.7 oz is a small bottle, fine for a bag, not for anything larger
  • The wrong choice for unfinished full-grain, where it would stop the leather developing a patina
TypeLeather paint + finish (2-in-1)
FormLiquid, brush / sponge / spray
Size1.7 oz
Best forFinished, pigmented leather, Recoloring over a filler repair, Color-matching in 16 shades

Construction note. The listing says it dries within a few minutes and seals itself, but asks for 24 hours before the item is used. On a bag, treat that as the minimum before the panel touches clothing.

Specs read from the product listing, on September 20, 2026. “Not published” means the brand does not state that figure.

#3Best for shade matching

Furniture Clinic Leather Recoloring Balm (Medium Brown)

The recoloring balm most people mean when they say 'leather repair balm', from a brand whose own listing sets the one condition that matters for a bag: it works on ABSORBENT leather only. If a drop of water soaks into an unmarked area of your bag, this is the better-graduated color range. If the drop beads, skip to the repair paint below.

Strengths

  • Sold in separate Medium Brown, Dark Brown and Black listings, so a closer shade match than a single-brown product
  • Listing states it fills minor scratches and repairs scuffs as it recolors
  • Three-step method the brand publishes: clean, rub in, buff off
  • Brand states the product carries the Good Housekeeping Seal

Trade-offs

  • The brand's own kit listing says the balm is for absorbent leather only; most finished, pigmented handbag leather will not take it
  • Every surface the listing names is furniture or a car seat; a bag is not mentioned
  • Fluid-ounce size is not stated on the standalone listing
  • A tub and a cloth, not a precision applicator, so a small handle or strap edge is awkward
TypeRecoloring balm
FormBalm (tub)
SizeNot published
Best forAbsorbent (aniline-type) leather, Faded panels, Shade matching in brown or black

Construction note. The absorbency test comes from the brand's own restoration-kit listing: put a drop of water on an undamaged spot. If it soaks in, the balm is suitable; if it sits on the surface, the leather is sealed and the balm will not bond properly.

Specs read from the product listing, on September 20, 2026. “Not published” means the brand does not state that figure.

#4Best for worn edges

Fiebing's Edge Kote (4 oz, Brown)

The fix for the most common damage on a well-used handbag, which is not a scratch at all: the painted edge on the handles and strap wearing pale and rough. Fiebing's is the leathercraft-supply name for edge finishing, the listing names purses and bags outright, and a 4 oz bottle will re-edge a bag several times over.

Strengths

  • Listing names purses and bags among its intended uses, along with shoes and belts
  • Dries flexible and water-resistant, per the listing, which matters on a handle that bends all day
  • Can be thinned with water for a lighter coat and buffed after drying
  • Sold in Brown, Black, Dark Brown and Neutral, the four edge colors most bags use

Trade-offs

  • Edges only; it is not a fix for the face of the leather
  • Semi-gloss finish, so a matte factory edge will look slightly shinier where repaired
  • No applicator is described on this listing; a fine brush or edge tool is a separate purchase
  • A steady hand is required: anything that strays onto the grain side has to be wiped instantly
TypeEdge coating
FormLiquid edge paint
Size4 oz
Best forHandle and strap edges, Flap and gusset edges, Sealing a cut edge

Construction note. Lightly sand or scrape the old, flaking edge paint smooth before coating; new edge paint over a lifting old layer peels with it. Two thin coats beat one thick bead.

Specs read from the product listing, on September 20, 2026. “Not published” means the brand does not state that figure.

#5Best for cuts and holes

Angelus Leather Filler (2 fl oz)

The honest answer to a mark that catches your fingernail. A balm or a paint hides color loss; only a filler replaces missing material, and this one is from the same American leather-paint company whose suede kit sits in our suede roundup. It dries white and it is a two-stage job by design: fill, then color over it with a paint such as the Furniture Clinic above.

Strengths

  • Listing states it stays flexible with the leather and is paintable once dry
  • Works on leather, vinyl, patent and bonded leather per the listing, so a trim panel is covered too
  • Made in the USA by a brand in business since 1909
  • A 2 oz jar is a lifetime supply for bag-sized repairs

Trade-offs

  • Dries white, so it always needs a matching color product on top; budget for two purchases
  • Listing scopes it to minor holes and scratches in smooth leather; not suede, not a torn strap under load
  • A filled spot on a bag flexes far more than a couch panel, so keep the repair small and thin
  • Every example the listing gives is a car seat, couch or shoe; bags are not named
TypeFlexible repair filler
FormPaste
Size2 oz
Best forSmall holes and cuts, Deep scratches that catch a nail, Cracks in finished leather

Construction note. Fill in thin layers rather than one thick one, and stop level with the surface. The color coat goes on after the filler has fully dried, never mixed into it.

Specs read from the product listing, on September 20, 2026. “Not published” means the brand does not state that figure.

#6Best for lifted lining and trim

Fiebing's Leathercraft Cement (4 oz)

The adhesive a leather repairer would actually reach for, rather than a super glue. Water-based, non-toxic, non-flammable and clear-drying by its listing, and made for leather-to-leather and leather-to-lining joins, which covers the three glue jobs a bag ever needs: a lifted edge, a peeling lining and a piece of trim that has let go.

Strengths

  • Water-based, non-toxic and non-flammable per the listing, so it can be used indoors on a bag
  • Dries clear, so a thin line at a lifted edge disappears
  • Listing names purses, wallets and jackets as well as shoes and furniture
  • Bonds leather to other materials, which is what a peeling fabric lining needs

Trade-offs

  • Glue is not a repair for a strap or handle that carries weight; that is a stitching job for a cobbler
  • A contact-style cement wants both surfaces coated and pressed, which is fiddly inside a bag
  • Any squeeze-out on the grain side dries to a visible sheen, so apply less than looks necessary
  • Not a filler: it closes a gap, it does not replace missing leather
TypeWater-based leather adhesive
FormLiquid cement (bottle)
Size4 oz
Best forRe-gluing a lifted edge, Peeling lining, Loose trim or piping

Construction note. The listing describes it as quick-drying and permanent. Work on one join at a time, press it closed, and leave it weighted while it sets rather than testing it early.

Specs read from the product listing, on September 20, 2026. “Not published” means the brand does not state that figure.

First, name the damage

Every wrong repair we have seen described starts with the wrong diagnosis: a filler used on a scuff, a glue used on a strap, a balm used on leather that cannot absorb it. Before any product, hold the bag in daylight and decide which of these five you are looking at. Each maps to one pick on this page, and only one.

  • Color loss with no depth.Corners, the base, the spot where the strap rubs. The leather is intact but pale. This is the recoloring balm’s job, and on a brown bag the Leather Honey is where to start.
  • Color loss on leather that beads water. Same look, different surface. If a drop of water sits on the bag instead of soaking in, the leather is sealed and a balm will struggle to bond. That is what the Furniture Clinic repair paint is for.
  • A worn painted edge.The handle or strap edge has gone pale, rough or cracked. This is by far the most common damage on a well-used handbag, and it is not a scratch: it is edge paint wearing through. Fiebing’s Edge Kote fixes exactly this and nothing else.
  • A mark that catches your fingernail. A cut, a small hole, a gouge. Material is missing, and no color product can put it back. Only a filler can, and the Angelus is a two-stage job: fill, dry, then color over it.
  • Something has come unstuck.A lifted edge, a lining peeling away, a piece of piping loose. That is an adhesive job, and the Fiebing’s cement is the leather-specific one rather than a super glue.

Anything not on that list, which includes a torn strap, a broken handle, a failed zip, cracked or lifting finish across a whole panel, mold, and any damage to suede, patent or exotic leather, is covered in the last section of this page, and the honest answer for most of it is a restorer. Our troubleshooting guide walks through the symptoms that are not repairs at all.

How we ranked them

1. A listing that says what it is for

This category is sold to furniture owners, and a listing’s own list of surfaces tells you how much thought the maker has given to a small, flexing, hand-held object. So we recorded it for every pick. Three listings here name bags outright: the Furniture Clinic repair paint says “handbags,” and both Fiebing’s products say “purses” and, for the Edge Kote, “bags.” The Leather Honey balm says “accessories.” The Furniture Clinic balm and the Angelus filler name only furniture, car seats and shoes, and their cons say so. None of that makes a product unsuitable, but it changes how carefully you should test.

2. The least drastic fix first

A recoloring balm is buffed on and buffed off; if you dislike the result on the base of the bag, you have lost very little. A paint cures on the surface and changes the feel of the leather where it sits. A filler adds material that has to be colored over. We ranked in that order deliberately, and our advice is to work through it in that order too: try the balm on color loss before the paint, and never reach for the filler on a mark that is only pale.

3. A brand with a track record

Leather Honey has made leather care since 1968 by its own account; Fiebing’s and Angelus are the two names any leatherworker will recognize from a craft supply shelf, and Angelus states it has been in business since 1909. Furniture Clinic is a leather-restoration brand whose listing states its balm carries the Good Housekeeping Seal. The dozens of near-identical ten-color kits from storefront brands were left out, and the section on exclusions says why.

4. In stock, at a live price

Every pick was in stock with a live price on September 20, 2026. Prices on this page update automatically; if one ever shows “Check price,” the live feed could not confirm it that day, and we would rather say that than show a stale number.

The water-drop test: balm or paint

The single most useful thing on this page comes from Furniture Clinic’s own restoration-kit listing, which states plainly that its recoloring balm is for absorbent leather only: if a drop of water soaks into an undamaged area, the balm is suitable. The reverse is the part most buyers miss. A great many handbags are made of pigmented, finished leather with a sealed top coat, which is what makes them wipe-clean and resistant to rain. Water beads on it. A balm that needs to soak in has nowhere to go on that surface, and the result is a smear that comes off on your coat.

So do the test before you order anything for color loss. Put one drop of water on an unmarked part of the bag, somewhere low, and watch it for a minute. If it darkens the leather and disappears, the leather is absorbent and either balm on this page will work; choose the Leather Honey for a plain brown bag or the Furniture Clinic if you need to match a medium or dark brown or a black. If the drop sits there as a bead, the leather is finished, and the repair paint is the product built for it. If you are unsure which leather your bag is at all, our guide to leather types explains aniline, semi-aniline and pigmented finishes, which is the distinction this test is really measuring.

What we left out, and why

The ten-color couch kits. COCONIX and a dozen storefront brands sell the same idea: a set of colored fillers and a mixing guide, fourteen pieces in the COCONIX box by its own count, sold for furniture, car seats, sofas and marine upholstery. They exist to rebuild a cat-scratched sofa arm, and for that they may be fine. On a bag they are the wrong tool three times over: the colors must be mixed to match, the filler is designed for a flat panel that does not flex in the hand, and for similar money a single purpose-made product does each job better. The one on this page that does fill, the Angelus, is a filler alone, so you choose your own color product to go over it.

Sewing awl kits. A hand-stitching kit with waxed thread and a curved needle can genuinely close a seam, and if you already know how to saddle stitch you do not need this page. If you do not, the seams a bag fails at are the ones carrying its weight, at the strap anchors and handle roots, and a first attempt at hand-stitching is not the place to learn. A cobbler will re-stitch a strap anchor for less than the cost of the bag and far less than the cost of a strap that lets go on a station platform.

Super glue.Cyanoacrylate bonds instantly, dries rigid and white-blooms on dark leather. Every one of those is wrong for a material that bends. The Fiebing’s cement is here because it is a flexible, water-based leather adhesive that dries clear, which is the opposite on all three counts.

“Faux leather repair kits.” Peeling on a bag that was sold as leather is usually a coated synthetic delaminating, and no product reverses that; the top layer is gone. If your bag is peeling in sheets, our guide to spotting fake leather will probably confirm what has happened, and the honest advice is to spend the kit money toward a replacement.

Anything for suede or patent. Nothing on this page belongs on napped leather or on a high-gloss finish. Suede has its own kit in our suede and nubuck care roundup, and patent damage is almost always coating damage that a consumer product cannot repair, as our patent and specialty leather guide explains.

Which one to buy

For a scuffed or faded brown bag, the Leather Honey Recoloring Balm. Do the water-drop test first, spot-test on the base, apply a thin layer with the built-in sponge, let it dry and buff. It is one shade of brown, so on a tan or cognac bag expect the treated area to come out darker; on a chestnut or chocolate bag it is the easiest repair on this page. If the bag is black, the same product is sold in black.

For a bag that beads water, the Furniture Clinic Leather Repair Paint. Sixteen colors, brush or sponge application, handbags named on the listing, and a self-sealing finish. It is paint, so use the least you can: thin coats, feathered out past the damage, and a full day before the panel touches clothing. This is also what goes over a filled repair.

For absorbent leather where the shade matters, the Furniture Clinic Recoloring Balm. Medium brown, dark brown and black are separate listings, which is a better match than one brown for a bag whose color you care about. Its listing never mentions a bag, and its own absorbency rule is strict, so this is the pick for a vegetable-tanned or aniline bag and not for a wipe-clean one.

For worn handle and strap edges, Fiebing’s Edge Kote. Scrape the flaking old edge paint smooth, then two thin coats with a fine brush you buy separately, because this listing does not describe an applicator. It dries semi-gloss, so a matte edge will be a touch shinier where repaired. Four colors cover almost every bag: brown, dark brown, black and neutral.

For a cut or hole, the Angelus Leather Filler, then the paint. Fill in thin layers, level with the surface, let it dry fully, then color it with the repair paint above. Keep the repair small. A filled spot on a bag flexes constantly, and the listing itself scopes this to minor holes and scratches. A cut longer than a fingernail is a restorer’s job.

For anything that has come unstuck, Fiebing’s Leathercraft Cement.Lifted edges, a peeling lining, loose piping. Coat both surfaces thinly, press, and weight it while it sets. It will not hold a strap that carries the bag’s weight, and it should not be asked to.

If you only want to own one thing from this page as insurance, make it the Edge Kote in your bag’s edge color. Worn edges are the damage almost every leather bag eventually gets, the fix is cheap, and it is the repair that most changes how old a bag looks. Everything else can be bought when the damage actually happens. For the four everyday products a bag needs before it is ever damaged, our care starter kit is the shorter list.

When a kit is the wrong answer

A repair product is for a small, defined fault on a bag you would rather keep than replace. It is not for any of the following, and using one on them turns a fixable problem into an expensive one.

  • A torn or tearing strap, or a handle pulling away. Load-bearing leather is stitched, not glued or filled. A cobbler or leather repairer will re-stitch or replace it, usually the same week.
  • A failed zipper. No kit here touches hardware. Zips are replaceable, and our hardware guide explains why a zip, not the leather, ends most bags’ working lives.
  • Finish cracking or lifting across a whole panel. That is the top coat failing, not a scuff, and a whole-panel refinish is a professional spray job with a stripped and re-sealed surface. A balm on top of it comes off with the old finish.
  • Mold, smell or stickiness. Not damage to repair but a condition to treat, and each has its own guide on this site, starting with mold removal.
  • A valuable, vintage or designer bag. Any consumer color product is permanent and any restorer will tell you it makes their job harder. Get a quote before you open a jar.

One more thing a repair product is not: a substitute for the boring routine. A bag that is cleaned and conditioned two or three times a year, and stored stuffed and out of plastic, is a bag whose corners do not scuff through and whose edges do not crack. Our conditioning guide and storage guide are the cheapest repair kit there is.

Frequently asked questions

Can you use a leather repair kit on a handbag or purse?

Yes, with two conditions. The product has to match the damage, because a filler on a scuff or a balm on sealed leather makes things worse, and it has to be tested on the base of the bag first, because every color product is permanent. Most kits are made for furniture, so we recorded on each pick whether its listing names bags at all; three of the six here do.

What is the difference between a recoloring balm and leather repair paint?

A recoloring balm is a pigmented cream that soaks into absorbent leather and is buffed off, so it is the gentler product and easy to test. Repair paint is a flexible paint-and-finish that sits on top of the leather, which is why it works on sealed, pigmented leather where a balm cannot get in. Put a drop of water on the bag: if it soaks in, use a balm; if it beads, use the paint.

Will a leather repair kit fix a torn strap?

No. A strap or handle carries the weight of the bag and is held by stitching, and neither a filler nor an adhesive is a substitute for stitching under load. Take it to a cobbler or leather repairer, who can re-stitch a strap anchor or replace a strap far more cheaply than the bag cost.

Why do the edges of my leather bag handles look worn and rough?

Because most bag edges are not raw leather but a painted edge coat, and it wears through with handling. It is the single most common form of damage on a well-used handbag and it is not a scratch. A leather edge coating such as Fiebing's Edge Kote, applied in two thin coats over a smoothed edge, restores it. Choose the color of the original edge, not the color of the leather face.

Can I fix a hole or a cut in a leather bag myself?

A small one, yes: a flexible leather filler applied in thin layers, dried fully, then colored over with a matching leather paint. Keep it small, because a filled area on a bag flexes far more than the couch panels these fillers are designed for. A cut longer than a fingernail, or anything on a strap, is a job for a professional restorer.

Do any of these products work on faux or bonded leather?

The Angelus filler states it works on vinyl, bonded leather and pleather as well as leather; the other picks are described for leather. But if a bag sold as leather is peeling in sheets, the coating has delaminated and no product replaces a layer that is gone. Check whether the bag is real leather first; if it is a coated synthetic that is peeling, the money is better spent toward a replacement.

Should I condition the bag before or after a repair?

Clean before, condition after. Every listing here asks for a clean surface, and conditioner or oil on the leather will stop a balm, paint, filler or cement from bonding. Once the repair has fully cured, which for the paint means a full day, condition the bag as normal and work around the repaired spot lightly the first time.

Sources

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