I have done oxygen and propane, Whit the small welding kit you get in home depot. I pluged the barrel with a piece of fiberglass insulation. I filled the chamber with the mixture of oxygen and propane and hit the ignitor. All I rember was knealing down and hitting the ignitor and when It blew Up I w...

Hi I am new on this site, but I have been making these for many years. I have always used Brakleen that is used to clean oil off of brakes when you do a brake job on your car. There is two kinds, you want the one with toluleen. The flamable kind. My potato gun is double walle in the cumbustion chamb...