'Lo John, Corecell-A is definitly a marine foam and has superior impact resistance and bonding properties. See, for a comparative overview:
http://boatdesign.net/articles/foam-core-properties/
...hope that works
Thanks Mike, for explaining the mechanical properties of fiber vs silica. If it is strength you crave then kevlar pulp is the filler you need. It is said that for a given thixotropic gel you need much less quantity than silica. (Compared to flocked cotton, don't know - but cotton comes from Arkansas and Kevlar from some nasty military/industrial plant) And that probably means the kevlar mix will 'flow' better into all the incidental spaces in a recore.
Also, I would not get gridded foam - unless you're vacuum-bagging. IE, imco, the cuts can only weaken the finished deck if they are not all totally filled with resin.
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