get a foamie and save yourself lots of time and money and frustration. EPP as suggested. I started with the DW Foamies, which is primary depron foam. They have a "fusion" model that combines EPP and Depron for the best of both worlds. You get forgiving nature of EPP on the fuselage that withstands all the mishaps and crashes with the crispness and flying qualities of a depron wing and tail surfaces that make it fly and float like a 30% model. And it's only 70 bucks and Mike is one of the very best in the business with customer service.