YMMMV, of course.
So I guess the kegs are out.
I like Plasti-Dip S over canvas. It's about $40, requires no primer, and dried to something like an expertly installed vinyl wrap. Except you can pile on coats until you're happy. You can spray it over a wide variety of materials to unify the appearance right down to the aluminum tape.
It comes from Plasti-Dip in basic colors, but dipyourcar.com has every color of the rainbow from camo to pearlized flip-flop top coats.
I think there is a picture in my albums of thick Plasti-Dip.
Yup.