I haven't used Propylene but I use oxy/propane and oxy/acetylene. Acetylene is hotter and I find it nicer to use but I used Acetylene when starting out so it could just be what I'm use to.
It's up to you really but you can build a perfectly good frame with propane.
I haven't used Propylene but I use oxy/propane and oxy/acetylene. Acetylene is hotter and I find it nicer to use but I used Acetylene when starting out so it could just be what I'm use to.
It's up to you really but you can build a perfectly good frame with propane.