Back in 2008 we acquired a 13' Casita Patriot Deluxe , It had been in the desert for years and was badly dried out the finish was chalky . I tried to restore the finish in one spot and it was not having it .
So I took it to a boat shop that does
fiberglass . They took a look at it and said leave it for the day . When I picked it up that evening it was shiny and smooth . They said it was really dry and sucked up a lot of product .
It was still that way when I
sold it it 2018 . All I did to maintain the finish was to use Meguier's Quick Detailer mist and wipe with a microfiber towel . This is how the majority of the washes the trailer got .
Of course it didn't hurt that it lived it the garage when not out camping