Postby tryg » Sat Jan 09, 2010 4:23 pm
Irrespective of what others say work, the correct way is to de-wax and remove grease with an appropriate product (wont mention brands as people always know better ones, so use whatever you like), then use a plastic adhesion promoting primer, as a minimum.
The adhesion promoter chemically binds to the plastic and also presents the best surface for acryllic or enamel based paints to adhere. You should follow the directions, because most adhesion promoting primers need you to lay paint whilst still just tacky.
Good luck.