I have been applying Tru Oil and Armour all on a scratch piece for a test, it seems to really work as described, basically dry to the touch and I am recoating in less than 1/2 hr, its very thin so lots of coats but no runs or sags, as for longevity the original guy (from a gun forum)shows stocks from 5 years ago that are still pretty nice
Seems to work best when it is heated with friction from rubbing with your fingers so might not work on skins