Let me say to any of you that have ever harbored the thought of TRYING to pour your own foam, think of the worst surfboard building disaster you've had and multiply by a hundred. Do you remember Bopal India, site of a Union Carbide plant, where thousands of people were killed when an accidental cyanide release occured. They were producing a chemical at the plant that is called TDI, a crucial chemical in Polyuerethane foaming resins. When it reacts, it gasses cyanide, foam as it expands, exerts hundreds of pounds of pressure. The molds are solid concrete, reiforced with steel and outfitted with hydralic clamps to keep them shut during the actual "blowing" of the blank. Mold release paper has to be used to keep the foam from marrying the mold. And least of all, the foam must be poured without being filled with more holes than foam. Why do you think there are only 2 polyuerethane foam surfboard blank builders in the US. They are professionals and we still get blanks that have problems,ah, go ahead, give it a try. Whatta' ya' got to lose.