it special from Sherman Williams PIA to spray it is like maple syrup, you cannot thin it or it goes smooth, believe me I tried it. I want water transfer decals, I am actually thinking of making some small silk screens for the common stuff on all the machines, looks pretty east, print it out on film, rinse it off and mount it on a frame. Might try it on the 1940's test sets, I think I will just do them and the 820's since I have spare parts.