;D
I've mentioned this product before.
It's called POR-15.
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They make sealers too.
I can vouch for the product at least the things I've bought.
Not cheap, but when they're applied as directed and fully cured, they harden like ceramic.

Maybe not for everything like NeverWet claims it is, but I've always found that many of those items that claim to many uses never do anything really well. :-/