Shoe goo is often recommended, but truth be told I usually just ignore such abrasions. Not saying that is the best approach, but I have not generally found that tires actually fail at the sites of such damage, unless it is worse than it looks in the picture. On the other hand a little shoe goo isn't going to hurt anything,
Another product that might work is Aqua seal. I have used it on all kinds of outdoor gear, but most often whitewater boating gear. It dries clear and tough and seems to adhere to just about anything. I have never used it on tires though. They have a version of the product that is meant for shoes, but I'd use the regular stuff myself if trying it.
The tire doesn't look structurally compromised to me. Maybe the cord might be subject to UV damage over time if not covered with something. A thin coat of shoe goo would do that well enough. On the other hand, like I said I have gotten by with just ignoring damage like that.
Last edited by staehpj1; 07-31-20 at 09:16 AM.