I'm having an issue with my leather stripping paint off of metal. At first, I only had it happen with a measuring square so I figured it was just a crappy paint, but recently a friend placed his wallet down on one of those outdoor expanded metal tables and it came off with a stained imprint of the grate. Has anyone had a similar issue, and found a correlation between different finishes/leathers and protection from staining?
I'm using pretty bottom-end veg tan from Tandy (Oak-leaf and the like). The measuring square was used on only natural veg-tan, and the wallet was darkened with olive oil and otherwise unfinished. For other products I finish with Neat-Lac or beeswax.
Would include pictures, but can't figure it out.