Hey JB,
I painted Kristiana's helmet Pink a few (3) years ago. Just because it had to be PINK I am sure you understand lol. Pink board, pink wet suite, pink paddle and music well she listens to PINK PMSL.
All I did was use 120 grit to rough it up, then there is a grey plastic etch primer in a can you can buy from Supa Cheap Auto. This bites into the plastic and becomes a base for the top coat. It is used for painting plastic car bumpers.
Then you paint over the etch primer and it lasts for ever, well i finally recoated it this year!
Phill

