I believe it is rubber or EPDM. I haven't used any protectant on mine yet, but have added solar panels and a satellite dish and sealed all mount points with self-leveling Dicor.
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John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
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