Bill at White Box stoves has super customer service. I had e-mailed him a question about melting one of his windscreens. I was using my trustyWB with some old denatured alcohol( 2 years old?) that I had. The stove burned really fast, too fast to boil 16oz of water, which was very odd. I added more fuel and boiled my water. When I rolled up my windscreen there where melted holes all around it. I believe it was contaminated alcohol that caused a flair up. I tested at home with my WB and a pepsi stove I tried at the same time. Both stoves flaired up after about a min of burn. Bill not only sent me two free windscreens, which he did not have to or was asked to, but also one of his new stlye stoves. Big ups to White Box stoves.