Originally Posted by
Kogswell
Never use anything that looks like oil or grease on your saddle. They will soften the leather too much and ruin it. Proofide is fine because it's wax. I like paraffin because it's harder.
Proofide is not wax. It may contain paraffin and beeswax but it's mostly tallow/oil based. Read the label.
I have used proofide on one B17 and neatsfoot on another. I defy anyone to tell the difference except the one with neatsfoot is slightly softer.
If you really want to ruin a leather saddle, start messing with the tension adjustment.
http://sheldonbrown.com/leather.html