So, I've got my tubing, lugs, and all the other bits and bobs. I also got some strait gauge 4130 from Spruce to practice with. I'll be shopping for my torch handle/tip this weekend. Question: The guy at the weld shop I was in earlier recommended a powder type flux called Marvel- "just dip the rod in there, works great!". Everything I'm reading/seeing shows you guys using a paste type (Harris?) and slathering it on pretty generously. Has anyone used this powder type? Results? Thumbs up or down?