well as far as epoxy paint goes it is really hard and works the best on steel because there is no flex ..I would never use it on fiberglass because it flexes just a bit and will crack up ...I would sand it with 80 primer it wetsand the primer with 400 ,seal it and paint & clear ...I think that would be the best bet and will give you a amazing look ..But it all comes down to how good you want it to look ?