Leather Properties and Care
What Does Leather Conditioner Do?
Leather conditioner puts oil back into leather to keep it supple. What it does, what research and conservators say about lifespan, and when it backfires.
Leather conditioner puts oil or fat back into leather to keep it supple and stop it drying out, which is what makes dry leather stiffen and crack. It tops up the lubrication the tannery added, which age and harsh cleaning can strip. It helps leather you use. Whether it makes leather last longer is disputed, and too much can cause problems.
This answer is part of our hub on leather properties and care.
What conditioner does, and does not do
| Claim | What the sources say | Fact |
|---|---|---|
| Keeps leather soft | Yes, while the item is in use | – |
| Replaces lost oils | Yes. Tanneries lubricate leather in the crusting stage; ordinary dry cleaning strips oils | – |
| Improves water resistance | Oiling can improve it | – |
| Makes leather last longer | Sources disagree (see below) | – |
| Restores old, brittle leather | Rarely. Museum treatments seldom met that goal | – |
Does conditioner make leather last longer?
Here the sources disagree, so we show both sides:
- An encyclopedia view says frequent oiling with mink oil or neatsfoot oil keeps leather supple and improves its lifespan dramatically.
- The US National Park Service says research found dressings have no preservative effect, and a long-term trade study found undressed leather was not more prone to decay.
The NPS still says dressing items that must keep working, like work boots, baseball gloves and saddles, is fine. The benefit shrinks over time, and oil, once applied, cannot be taken back out.
Tanner Leatherstein, a leather maker and tanner, argues that most chrome-tanned or combination-tanned goods do not need conditioning products, and shows a waterproofing product darkening a vegetable-tanned piece. He makes an exception for natural vegetable-tanned leather, which can dry out in heat and sun. Treat it as one practitioner's view in the debate above, and note his advice to test any product on a hidden spot first.
What too much conditioner can do
Museum conservators list what the oils and waxes in dressings can cause:
- A white, waxy bloom called spew (see leather spew vs mold)
- Darkening, stains and a sticky surface
- Rancid smells and stiffening as the oils oxidize
- Mold, because fats feed fungi and dressings can trap moisture
Conditioner vs cleaner, soap and repellent
Leather Collection's care instructions recommend a water and stain repellent, and warn that ordinary dry cleaning strips leather's oils.
| Product | Main job | Fact |
|---|---|---|
| Conditioner or oil | Keeps leather supple | – |
| Saddle soap | Cleans, conditions and softens | – |
| Shoe polish | Widely used to condition leather shoes | – |
| Water and stain repellent | Helps prevent water stains and soiling | – |
How to use it
How often and how to apply it are covered on hosob.com: how often to condition leather. For suede and nubuck, see is nubuck leather waterproof?, since smooth-leather waxes can ruin a napped surface.
FAQ
Do I really need leather conditioner?
For leather you use and flex, it helps keep it supple. For stored or display pieces, conservators advise against routine dressing.
Does leather conditioner work on faux leather?
Faux leather is a plastic coating on fabric and needs little maintenance. See will faux leather peel? for what actually damages it.
HitKB Editorial Team
HitKB articles are researched from published sources, cited in the text, and reviewed before publication.