How to Cut Styrofoam Artistically With Precision - Porched Living
Step 2: Use a sharp waxed kitchen knife to remove Styrofoam pieces. If you want to wax a knife, rub the whole blade over a candle as many times as possible. Use a white candle to avoid having a colored candle wax on your foam. Use a serrated knife to cut polystyrene foam with long and sawing motions.