I found out my chain is damaging my frame near the cassette. How can I repair this?

It was damaged by my cassette in the indoor trainer which I am not using anymore. This is how it looks:

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  • Thanks for the responses! More than cosmetic, part of the frame has "worn off" to the point where it gets near the screw as you can see in the picture. You mention I can cover that with nail polish, would plastic bonder work better? It might be fine structurally but I just want to protect it against further damage. Let me know what you think! – mtobon May 8 at 16:38
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    @Michael please post answers as answers. Check this metapost for more. rpg.meta.stackexchange.com/a/6534/63719 (yes RPG but still relevant) – Criggie May 10 at 20:10

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