Unless things have really changed. The "Paint" IS the gelcoat. Gelcoat is a color. It is the color of your RV. Usually with clear on it. And in my experience. The mold is gelcoated, and then the fiberglass is worked onto it. Fiberglass comes out of the mold "painted" the color its going to remain. It comes out waxed as well. That how they keep the gelcoat from sticking to the mold.
In other words. You want a blue fiberglass RV. You spray blue Gelcoat in the mold, and glass to it.
As for the Gelcoat cracking. It will often get spider webbed. But it is highly unlikely the glass itself cracked. It is still water tight.