I am on record as not being a big fan of washable paint. It doesn't cover
well, the paint separates easily in the bottle, and I think it stains my
hands MORE than regular paint. Being stuck with a few gallons of it, I
have been experimenting -- it does work well for painting on windows (must
be the lack of opacity). But I'll be sure to advise the kids against color
mixing with it!
Liz in rural NY