Per recommendation on this forum, I just filled voids on a pair of Loather Fidellio's with "Great Stuff" for "Windows and Doors" from Dow. This one doesn't expand as severly as some of the others and is guarenteed NOT to bend the frames of windows and doors. My cabinets were already built, so I drilled 2 5/8 inch hole, one to spray and one for viewing. It worked great, just follow the directions on the can. After it cured, the cabinets didn't ring as much when I did the "knock on wood" test.