Painting Fiberglass hood

First thing to do is let it sit in the sun for a few days. Its to make sure the fiberglass is cured. Here is what i do. I block sand it with 180 or 220 clean it then spray some high build primer on it at least 3 coats. Then block it with 400. Clean it then spray your black. They are never straight. The high build primer acts like a sealer unless you break through.