One thing that people never seem to notice is that different foam cores have VERY DIFFERENT bonding strength. You can't lump them all togather. The reason we use Corecell is because one day we took all the different foam cores we had around the shop and infused a piece of each one. The green stuff from vendor X, kinda' like a inexpensive Arex, bonded no better than peel ply. Just worthelss. The best were Divinalcell(sp?) and Corecell with Corecell being slightly better.