The best thing to do is contact the company and ask for their recommended treatment.
There are a couple of aftermarket sources. One that appears to be possible is a liquid produced by Starbright. It comes recommended for boat canvas and clothes, as a water repellant.
DO NOT USE Thompsons fabric waterproofer. It is not UV stabile and your natural fiber canvas will sun rot in one season. I know, I've ruined two boat canvases with this stuff!
You could also check with an awning shop. They might have a UV stabile product for outdoor use.
I used to use Camp Dry when we had our pop-up. It comes in a spray can and is easy to apply. I could usually treat the camper at least three times with one can. Did this for eight years - canvas looked real good !
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