Dallas, Your cutting board is probably HDPE, which you will find is (almost) impossible to weld with the air gun. Don't waste your time, or the cutting board. It'll only frustrate you and will ruin a perfectly good cutting board. Your description of the PVC burning is what I was seeing, too. I also had to put a regulator on my compressor, and then use the HF regulator to get the pressure down to about 4 psi. I set the compressor regulator to about 15 psi. I forgot to include that in my page. Go find some polypro. It'll make your learning so much easier. If you can't find any, let me know.craig