this post was submitted on 18 Jul 2023
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My first thought is great stuff but honestly I have only used it in a crafting context and I am sure someone else will have a better idea or be able to explain why my gut reaction is not going to work. Also could look ugly if the foam expands out of the hole though it can be cut off to be even once cured.
Great Stuff (or one of its analogs) is exactly what is needed here.
Sealant foam was also my thought.