pvc or hypalon?
I tried boards once, but they didn't agree with usage of the boat. Too many humans catching dive gear on the boards, going in/out. My avon numbers were painted, after 20 years faded out; but now has the hypalon letters basically superglued onto the tubes. Over 20 years, I have had to reglue some corners back on. OVerall, I'd say paint 'em on, as long as you haven't put any silicone on the tubes. Avon was made in 1976.