[Paddlewise] Waterproof impregnant

I want to make a so-so waterproof deck-bag out of old day-pack. Is there
anything in liquid or spray that works, and not too exotic - can't mail-order
such things into Canada (wouldn't make economic sense either). Tried 80/20 mix
of turpentine and silicon sealer a while ago on old nylon sprayskirt, - it
helped, but the smell from the bowl was terrible.
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