I used this stuff as it seemed to virtually identical to the material that I removed from my originals.
http://www.homedepot.com/p/Gardner-...110/100212441?keyword=Duct+Seal+Compound+Plug
Just wad it up into a big ball, stick it over the stud enough that it compresses when you tighten the moldings down. No mess, no fuss, and available at just about any hardware store.
http://www.homedepot.com/p/Gardner-...110/100212441?keyword=Duct+Seal+Compound+Plug
Just wad it up into a big ball, stick it over the stud enough that it compresses when you tighten the moldings down. No mess, no fuss, and available at just about any hardware store.