Thanks for the replies, yes I did mean the smooth part on my LS (my bad).
Bruce, did you use a primer or adhesion promoter at all? (on the filler or the rest of the instrument cover) Or would pastic-specific paint be enough?. Also did you paint the textured part or just masked it. Although I have some experience painting metal, and fiberglass parts I've never painted plastic so I thought I'd ask before I make a mess.
Luis