Has it done to the Foretravel motorhome that I just sold. The gell coat was dull and lifeless. After washing and then a thorough going over with TCP, 6 coats of liquid acrylic floor finish ( not Zep but a professional product with higher solids content) was applied using micro fiber cloths.
It was dry by the time one cost was done, so all six coats went on with 2 people in 3 hours (36' coach). Very, very shiny and lasted at least 6 months (sold the bus).
Just apply very thin coats. Avoid drips at all costs because they DO NOT come out except with sanding.
Lew Farber...ABYC Certified Master Marine Electrician...RVIA Certified Master Tech ...AM Solar Authorized Installation Center...AIRSTREAM Solar & Electrical Specialist