Hi all! I saw this post, and, as I have many years of research into leather care and many trial and errors, here's what I've learned and what works for me:
Things to avoid:
1. Animal products (mink oil, lanolin, neatsfoot, lexol, Doc Bailey's, saddle soap and anything saying it's used in the tanning process)
-trap moisture in the stitching causing it to rot out (the leather will look nice, but the item will fall apart)
-can cause over-softening and weakening of the leather, leaving it more susceptible to damage
-can clog the pores, making it so moisture inside can not escape (in the instance of attire, we're talking about sweat, which contains urea and other salts and acids and will deteriorate the leather from the inside out) and also preventing the leather from being able to absorb the moisture that it does need
-When tanners talk about conditioning, they're talking about re-hydrating the leather, not replenishing or replacing oils and fats.
2. Non-animal Oils like petroleum and silicone (found in Sno Seal, Saddle Soap, Doc Bailey's, lexol)
-due to their molecular size, they sit on top of leather rather than being absorbed (*Note, in order to make the leather absorb the oils, alcohol and solvents are almost always added, same goes for softening waxes like beeswax...those will be covered next), and the molecule size can also cause separation in the fibers of the leather (aka over-softening)
-silicone can actually fill in to the point that it is called "impregnating" the leather. This ordeal makes the leather extremely stiff (think of plastic surgery gone wrong) and fixing the issue must be done by a professional, is very expensive and the chemicals needed are very damaging to leather
-products that are able to get stuffed into the pores, thanks to solvents and alcohols, then get stuck and clog the pores (we went over this above), giving you a nice initial outcome, but with consequences over time.
-silicone products are also "build-up type" agents, that will accelerate heat and uv damage
-all of the above oils also leave a residue...for dirt, dust and whatever else to stick to, as well as wipe off on you
3. Soap (saddle soap, doc bailey's, Murphy's oil soap)
-too harsh for leather
-will dry out the leather
-can remove surface color
-can strip tanning agents, causing drying, cracking, hardening and shrinking
-high alkaline, which can cause damage and discoloration
4. Chemical Solvents and Alcohols (found in Sno Seal, Doc Bailey's, the majority of beeswax items because it's cheaper to produce that way)
-commonly used to facilitate pore clogging agents entry into pores
-compromises water based top protective coating (more susceptible to damage, scratches, pigment loss, fading) breaking it down and leaving a tacky surface
*Note-anything with dyes has alcohol (polish)
Moral of the story: You want a water based, natural product that contains no solvents, alcohols, animal oils or fats, petroleum, silicone, dyes, soaps or polish and won't clog pores.
THE WINNING PRODUCT: Riders Leather Seal
http://4beessake.com/