back when we had canvas tents we bought a product to reseal them...it looked and smelled for all the world like plain old PVA glue.it was painted on with a 4" paint brush and worked a charm (hint here DO NOT take your shirt off and get it on arm pits as it WONT wash off in shower LOL) we purchased product from smiths city in a 2ltr container.
hope that helps.
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