Sounds like you've found what you're looking for as an all-over application. However, if you're interested in wrinkling small areas, you could try the Rigid Collodion here:

http://www.costumesandprops.com/spec...cts_makeup.htm


Just apply and wait for it to wrinkle the skin as it dries. It looks like a good bunched up area of scar tissue that can be painted up. Then, it just peels off without any solvent.