Can you paint a vinyl door? Yes. Will you ever receive a guarantee that the paint on your vinyl door won't begin to peel or strip? No. Painting a vinyl door carries with it certain built-in expectations that a wooden door does not in that regard. Even so, the process is not nearly as painful as you might expect.
Begin the process of by applying a proper paint primer. A waterborne primer is ideal for composite materials like vinyl because it can be used on inside and outside doors. In addition, waterborne primer cleans up very easily with just soap and water and dries quickly. Allow the primer to dry completely.
The quickest and most painless method of applying paint to a vinyl door is with a sprayer. If you are not familiar with a paint sprayer, be sure to read the instructions or, even better, ask for details when renting or buying the sprayer. The only downside to using a sprayer to apply a brand new coat of paint to your vinyl door is that you will need to cover up any item in the room where the door is being painted. This means using tape to cover the areas around the door, removing small items and covering up large items with plastic. The paint from a sprayer is convenient because it covers a larger area than a roller or brush. Unfortunately, this means that the spray of paint may veer off course and cover areas you do not necessarily wish to be painted.
Painting a vinyl door can be done old school style with a roller or brush; it just takes a little bit more time. Be sure to cover up any window panes in the door or any other part that you don't wish to be painted over. If there is a grain in the vinyl, you should paint with the grain rather than against it. The best way to ensure smooth coverage is to begin at the top and slowly move downward, starting each new application about 1 to 2 inches from the bottom of where the last brush or roller stroke ends.