rattler can painting door pannels ?

I have used VHT vinyl and carpet penetrating Color Dye works fairly well. PPG #UK403 Vinyl Cleaner and PPG #UK405 Vinyl Conditioner are decent.

1: The first step in dyeing any vinyl product is to thoroughly clean it with Vinyl Cleaner. This will remove any dirt, grease, or grime. Use a nylon bristle brush or course sponge to clean the item even if it is new. Do this two or three times. After it is clean, thoroughly rinse it with clean water. Then dry it completely.

2: Now wipe the item down with a Vinyl Conditioner. Use overlapping strokes and go in one direction only. Do not crisscross or change directions. After it is done, do not touch it with your bare hands. The oils in your skin can stick to the vinyl surface and cause the dye not to adhere properly.

3: You can now start to spray dye the item. Work in a well ventilated area. Use light overlapping strokes. Do not put on heavy coats because this can cause runs or blushing. ( Blushing means the dye will have a whitish cast and not look sharp. This is caused by too much paint and humidity in the air. It is a good idea not to do any type of dyeing on rainy or high humidity days.) Allow about 5 to 10 minutes between coats depending on the temperature. (Higher Temp = Less Time). When it is thoroughly covered, check it for light spots. If it is covered completely, let it dry about 1 hour. After it is dry, it will be ready to be installed.

SEM Color Coat For Vinyl, Leather, & Plastics is supposed to be real good

http://www.yourautotrim.com/semdye.html