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Good info, can you suggest some that don't require air?

Cheers, Steve

Hi Hirlau,

Short answer is yes, if the foam is not too thick or too large, as extends too far beyond the edges.

The long answer is that if the foam is thick as for an irregular stone or extends...

For the foam bases you can use spray insulation foam. Typically you can cut, sand, and paint this foam when dry. There's a little art to it, but not much. This method will work even if the stone is...

I've used expanding foam before and will try to post images and a description later this morning. It works well.

Cheers, Steve