Hi. As both John & Mike stated above, that's correct, use a primer that is designed for
fiberglass. Some auto paints are OK for fiberglass, just be sure that's what you're getting.
WE used: Rustoleum Marine primer (white) and Rustoleum Marine Topside
paint (white). Both in quarts. Brightside (Interlux) Marine paints are even better--not available close to us and pricier. WE also used Kilz enamel primer in some areas, such as over the area where the
battery had been years ago. We super-sealed that section! But our trailer has a wooden panel interior so we didn't do a top coat inside.
Marine paints don't offer many colors--but you CAN mix them with each other.
We decided to just use a lot of white.
We used enamel paints on the wooden cabinets. I really like the muted sheen of the Rustoleum marine enamel (white). We considered trying for high shine but decided this was more to our taste. We used a foam hot-dog roller (the little kind with the closed end) and Paul rolled for all he was worth and got all the bubbles out with just the roller--it self-levelled by the time it was dry, very nice paint...we didn't spray and we didn't "tip." (Tipping--after you roll the paint, you gently brush over with a dry brush to break all the little bubbles--Paul had no "tip touch" and it was just a better procedure for him to merely roll with serious intent).
Congrats on your new egg!
Although it may seem like a lot of work, do try to enjoy this time of restoration...you'll enjoy your work for many years to come! This is your big chance to make it the way you want it as much as possible.
(See the thread here, Fear of Fiberglassing for our restoration if you have any interest in it--we did do a lot of
painting inside, all cabinets and the support walls, which in ours now are made of 1/2" plywood. Photos--).
Trilliums are good trailers. Love the
windows.
We do also love pics here, if you can and will.
BEST
Kai
1979 Boler 1700
SOLD in April 2016.
SOLD in May 2021.
Peanut
Semper ubi sub ubi. 
Linear Mode
