I painted all my plastic inside mine 7 years
ago and it still look new . Don't settle for anything less than professional trade quality
like SEM product ,I don't trust spay can like Dupli-color , they don't last from my experience . Always use a paint preparation cleaner and softener for plastic before , this is the secret for a good bond.SEM and comparable product actually sink in the plastic and vinyl without altering the appearance . Have a try you wont beleive the result , now when I look for plastic parts for my cars I don't even consider the color I always go for the best part .
Benoit