Never tried to wash it off TBH - I expect it might though as it is a waterbased gun cleaner we use. I usually put 2 cross coats on with about 15 mins flash off between. I have never tried building up light coats.
Ratty is probably the man to answer that as I think that is one of the techniques they use in small repairs?
Don't be fooled into thinking 'cos it is waterbased it is safe to breathe. It still has a solvent content and a fair amount of it still has isocynates in it. Wear a mask, gloves and goggles to spray it and preferably disposable white overalls.
It gets into you through your skin, eyes and mouth so cover those and you will be fine
This will keep you safe for short term usage
http://www.toolstop.co.uk/index.php?opt ... edium=base