I am restoring a 78 MonArk. I am to the point of paint. This is my seventh complete restoration and I have always sealed the old paint on the fiberglass but just because the paint store told me to. I was wondering if it is original do I have to seal it. I always apply base coat clear coat automotive paints. The place I purchase the paint always ask me what type of paint I am applying it on and I always say I dont know and they say well you have to seal it then. That makes me think you can apply certain types of paint without a sealer/primer.