Yeah, that's some good knowledge Duane, I never knew any of that. This I can testify about - it completely screwed up my first paint-job. I used random spray paint bought from a DIY shop, with Halfords laquer and the two reacted badly, the paint all bubbled up. If you get all the paint from the same place (E.g. Halfords), it ought to be ok though. Back on topic, just roughen up the surface a bit with some coarse wet+dry, then some finer stuff.