I used "Never Wet" from Rustoleum last season and if you follow the directions, it works really good on canvas. It is a bit pricey, but does work.
Got to make sure the canvas is dry and clean and if you can apply in the garage or other calm area, it helps. I took two step ladders and a couple of 2x4's between them and spread my cockpit canvas over them. Took about 2 hours start to finish - I did 2 coats and it has to dry between coats.
Also use it to waterproof shoes, jackets, etc. - stuff works great!
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