You may have noticed that I never painted the TrailTop cover for the yellow trailer. In all the photos the fiberglass is still white, and the plywood center panel is sort of off-white, but that's because plywood I bought was pre-primed.
Painting it hasn't been important to finishing the proof-of-concept build so far, but lately I've been needing the garage space so I've wanted to leave it outside overnight. But I don't want to leave the unprotected wood outside, so I've been thinking I should either remove the cover or paint it.
I've been thinking of doing a proof-of-concept on the painting too - I'm intrigued by the modern "deck coating" products on the market - Olympic Rescue It, Rustolem Restore and Home Depot's Behr Deckover are a few of the type. All of these are thick, water-based acrylics that apply with a roller or brush and leave a textured finish, not unlike automotive bedliner products. The manufacturers say they're good for up to 10 years on a deck. Online reviews are not quite so glowing, with many saying their decks are peeling after the first winter. It's hard to believe these products would still be on the market if they were as bad as some of the reviews say, so I think it's worth some testing. A trailer top would probably have less abuse than a deck; after all a trailer could be garaged or covered with a tarp outside in the winter, so these products could work better on a trailer than on old, mildewed, pressure-treated, contaminated decks.
These products are about 1/3 to 1/4 the price of automotive bedliner, and they're tintable at no extra cost, so if it worked well on a trailer it could be a cost-effective, attractive and easy-to-apply finish.
The other day I was in Lowes and on their "mis-tint" table there was a gallon of Olympic Rescue It, tinted in a chocolate brown, which would go nicely with the yellow trailer and the tan tilt-up canvas, and it was at a cheep mis-tint price, so I bought it to experiment with.
I made up a plywood and a fiberglass test panel. I primed half of each with epoxy primer, which sticks to everything, and I'm brushing the recommended two coats of Rescue It on. The reason for the primer is that I suspect there may be an adhesion issue between the acrylic and the fiberglass, so the epoxy should provide a better base for the acrylic to adhere to.
I'll let these dry over the long weekend, the Rescue It instructions say to wait 48 hours, and then I'll see how it's sticking.