Hi Bernie -
I've used it for fin cores. Rumor has it that it is subject to breakdown... I.E. a sheet of it used as a skin core might result in some sort of internal rupture/separation in the core itself - not a direct delamination of the outer skin.
It was discussed on a homebuilt airplane site...
http://www.homebuiltairplanes.com/forums/composites/2898-last-foam-ok-maybe-new-parts-pvc-vacuum-infusion.html"One of the first tasks I did for Glasair was an engineering review of selected materials and specifically, foams. This was about a year (give or take a bit) after the company transitioned from Klegecell to the Last-A-Foam material. After about three months of research, my conclusion in the report was that the Polyurethane foam as manufactured by General Plastics is unsuitable for primary structure in any aircraft application. The reason was primarily due to the material's highly friable surface, which was susceptible to damage through impact or vibration, or simply though inadequate preparation prior to lamination. I also saw evidence that the cell and/or chemical structure of the foam at times interfered with the proper curing of the resin, often resulting in inadequate properties in service.
The result of the report was twofold - first, the company modified my text to suit their own needs, then buried it. However they did institute an improved handling and cleaning process (dedicated cutting room and a separate vacuum/clean room) that resulted in a much cleaner surface on the foam prior to it being placed in the mold. Now, it must be pointed out that outside of the damaged firewalls I have not seen nor am aware of any other failures of the sandwich as a result of normal service. But I still hold the potential is there."
