not sure if this helps but about 10 years ago i had a friend paint on the back of my leather jacket. she said that she found the best stuff to use is the cheapest of acrylic. rub it in real well. she didn't do anything to seal it i've lived in the cold wetness of seattle and the dry heat of san diego, ride all year long and in that time not so much as a flake or crack in the painting. and it still looks as good as when it was painted.