Aluminum Stick is difficult because of the travel speed you need to use. The secret is 500 degree preheat and run the rod at a 90 degree angle to the work. Otherwise it wants to spit aluminum all over. If you have oxy-acet set, Turn on acetylene only and smoke the part with the black smoke. Then turn on the oxygen and start heating the part. When the black goes away, You are at 500 degrees. ( or buy a temp stick ) Aluminum Stick rod makes a nice weld when used in a brazing application too. Use it just like brazing rod on on aluminum.