Assuming the upvc door is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend Technispray Kolorbond Aquatek.

This can be applied by brush roller or spray application.

There is no primer required but you must clean the uPVC with Technispray VinylKleen, then again with Technispray WindowPrep and finally abrade with a red Scotchbrite before application of Technispray Kolorbond Aquatek.

This then offers a 10 year adhesion guarantee and 5 year colour fastness guarantee.