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I think the common best practice these days is to forgo using any concrete at all and just "paint" the styrofoam with something like drylok. That way, you don't have to wait for the concrete to cure. Magnets should work if they're strong enough. Styro can shoot out of a tank with a lot of force if not properly secured.

edit: forgot to add the disclaimer that I have not constructed a background ever, but I read a lot of the threads around here. I'm sure the background guru's will be along with better advice in no time.
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