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Trouble with expanding foam is just that it expands, you may push the wall away from the outer skin. There is a product that you can inject into the wall it's the same as they use on floors, if the area is that small cut it out and repair from the inside, I have just done a hobby, by taking your time I removed the wall board, scraped the filling sealed with glue suitable for polystyrene stuck the insulation in then wall board finish off by papering over width a close match. Job done.
Never ever use expanding foam in such a small thin area, it will look like John Merricks head within 5 seconds, and delaminate a whole area of your sidewall. It is an extremely strong material. Injection of a suitable glue yes , but foam no.
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