Unfortunately, I will not be getting anymore as I have about 4 years supply now that I have added another 6 covers to the first lot I made, I don't weld that often now as I am retired however when I went to buy it, I stressed that it had to be Polycarbonate as it had to be impact resistant for a face shield and that is what he gave me. Could it possibly be that Jlg's plastic isn't Polycarbonate but some other form of plastic as the poly should not crack?