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Bondo will dissolve any kind of polystyrene foam---white expanded bead foam, blue or pink insulation foam, etc.


The solvent in Bondo is styrene monomer.  That's a liquid made of single-unit styrene molecules or "monomers."  That liquid will dissolve polystyrene molecules, which are "polymer" molecules made of chained-together styrene units.


You can seal polystyrene foam with epoxy so that you can put Bondo over it without dissolving the foam.


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