http://www.bangslabs.com/support/pdf/Solvent_Listing.pdfSearching on what a previous poster stated. Xylene (part of Additive F) dissolves polystyrene according to this link. . Xylene is also solvent. Who would of thought?
But over a sealed blank, no problem. If the blank is not sealed, the recommended concentration of AddF in the lam mix (1cc per oz of hardener) comes out to approx 1 percent by volume. At that dilution, I doubt any significant dissolution of the foam can be seen, but I have always sealed my blanks, so I don’t know.
JSS