Ok, Thanks guys, I'm convinced. I'll clean out the old areas of wet core
under the "bridges" of pieces that I will not cut off and shove in my epoxy
soaked pallets of new balsa core
and fill with epoxy
from the sides. I can get a peanut butter consistancy with the epoxy that I'll push in from the sides with the added microspheres to my C-Flex. I do appreciate your advice about the urethane foams and I will not use them!