One bit of advice on the Divinycell, you must fill the cells in the outer layer of the foam or you will be back to having a sponge that soak up your resin. Right before you lay up your piece, mix up a thick slurry of epoxy and microballons, spread this on to the Divinycell with a putty knife and fill the holes in the foam. Then proceed with your layup as normal. You will be amazed how much lighter this way comes out!!!

Darrin C