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The owner's manual doesn't say anything about applying any sort of sealant or protectant to the top. If it was truly required - or even beneficial - my theory is that GM would sell their own marked-up brand of it and insist that it's necessary in the owner's manual.
I worry less about rain water causing the fabric to get weird than some weird chemical formula (yeah, yeah, acid rain, yadda yadda yadda). Just my two cents.
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