SRanger
Go to FiberGlassics and they have a section Book Part 3 - Refinishing by Jamil Mehdi.
This is about the care and feeding of fibergass boats. Restore or Refinish? Polishing Gelcoats, Wet Sanding, Compounding, big and small fiberglass and gel coat repair, and to address your inquiry Gel Coat vs. Paint. You can oprint it (around 20 pages of great info/guidence and file for reference or just scan it.
Recommend highly.
Woody