I purchased a uPVC window painting kit as after 20 years the "light wood" coloured film on my conservatory uPVC roof slats had started to peel off, showing the white underneath. After rubbing down the loose film flakes, cleaning the slats, and following the painting instructions to the letter, the end result was really good. The paints appears to have fully bonded with the plastic. Obviously, only time will tell long term, but I am confident the paint will remain sound for many years to come. Top marks.