How to patch a Cab Cover

[BaliMawr]

I have a RainGear Cab cover, that I LOVE. Turns out, mice love it too. I made the mistake of leaving it folded in the garage for a week, because the grass was too wet to lay it out and stash it properly. Mice ate several holes through it. RainGear has not responded to Emails, their phone is off, VM full. I have the stuff sack, which appears to be made of the same material as the cover, and I can get another stuff sack. But what's the best way to make it waterproof? Shoe Goo? I have a punch awl, if it needs stitching. Patch inside or outside?

Thanks!

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