I never considered using 303 all over the awning, maybe because we just about never use our awning although that may change. I put 303 on top when rolled up. That is where some people have lost their awning --- ripped off across the top when rolled up, after becoming brittle.
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Cathy. Floating Cloud
"Live in the sunshine, swim the sea, drink the wild air.... "
Emerson
I did exactly what Cathy does, used the 303 on the top of the awning rolled up to protect it when stored. That is where the awning fabric seems to rot over time. When I used the awning at the lake recently there was this really good looking 1 foot section of awning where I put the 303, so I'll probably go ahead and wipe the rest of it down.