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Silver,

You certainly know more about chemistry than I do. I'll take your word for what 'Rain-X' is chemically. But it 'works' like a wax. You put it on, it cures, and you polish off the residue,...

For the 'cheapies' among us:

Silicone Water Guard, available at WalMart in the camping section, will permanently waterproof your flies. After that, you don't 'need' anything else but a clean and...