Our blog post, How To Paint Plastic And UPVC, details how to clean and prepare surfaces using Zinsser Bulls Eye 1-2-3 prior to Zinsser Perma-White Interior (for interior jobs) or  Zinsser Allcoat Exterior Satin & Gloss (for exterior work), both available in over 350 colours. Be sure to read carefully the steps on cleaning the surface and preparation for maximum adhesion.