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Reply to "How to glue foamboard to a plywood base?"

Its probably fine. Any of those liquid nails glues will stick to foamboard, some just react with the foam more than others. In any case, if you bond it to plywood, dont expect to get it off intact. You can also stick foamboard down with great stuff spray foam, just weigh it down while the expanding foam cures.

Hot glue or white glue are less permanent/easier to remove.

Thanks. When it needs to come apart, I will be long gone and my kids or grandkids can worry about that.

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