Good quality linear polyurethane would be my choice, in blast white gloss. Basically treating the roof like the topsides of a boat would be my approach. West Marine offers these instructions which seem pretty good to me.
Now back to HerculeanProcrastination
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Baja-tested '08 2-slide 36' Alpine: The Ultimate DIY'er Project
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We were once looking for a Break Out Another Thousand a few years ago. Boats that had been LP'd looked beautifully smooth and the coating was almost plastic to the touch. Most had the work done in Mexico.
I think it is a good bet for us in the '00. Now to get the gumption to do it ourselves.
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Tom, Patty, Hannah "The Big Dog" and Abby Kat, Indianapolis, Indiana 2000 Alpine 36' FDS 72232, 2005 Blue Bird M450 LXI Our Photos
"We live out in our old van. Travel all across this land. Drive until the city lights dissolve into a country sky, just me and you - hand in hand." Zac Brown Band
We treat our roof as if it were a boat, and treat the fiberglass and the plastic with a UV protectant annually. We also treat the slide toppers as they seem to be vulnerable to UV exposure. We had to replace them at 3 years due to excessive cracking.
John wears his boat shoes (Sperry Topsiders) when up on the roof (we used to own a sailboat - seems like we were constantly cleaning and treating the fiberglass :( ).
Tom, Patty, Hannah "The Big Dog" and Abby Kat, Indianapolis, Indiana 
Linear Mode
