Use an artist's brush and acrylic paints to paint on the tar paper. Be sure to keep the edges flat as you paint toward them. You can paint on felt cloth or felt paper. Acrylic paints are best in this case.
To paint on felt fabric, you may need to consider using a primer before proceeding with painting. There are several techniques available to use while painting on felt paper. You can paint directly on the tar paper or use a soap protector. You can also decide to use chalk or cut out painted pieces, turning them into a beautiful hot-glued collage.
With felt paper there are almost no limits. Now, if you ask the question “can I paint my roofing felt? , so the answer is, of course, that you can paint your roofing felt. There are many types of paints available on the market and not all types of paints can be used for roofing felt. Since roofing felt is used as a water-resistant protective layer between the roof covering and the shingles, you should opt for a strong paint to keep it in its best condition.
Bituminous paint is a traditional solution used to paint metal, shed felt, concrete, and most types of roofing materials.