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  • If it’s a deep gap I’d be inclined to squirt expanding foam in there all the way down, cut the excess, then finish with acrylic.

  • I always worry about the expanding foam expanding too much and blowing out stuff, or is there no need to worry about that? It's about 20cm deep.

  • Others can correct me if I'm wrong on this, but I don't think the foam exerts much force on expansion. It expands first, then sets. I certainly haven't seen anything move as a result of using it.

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