I did, I sanded the crap out of it, until there were no grubby marks on it, then brushed it down before applying the flux.Technician1002 wrote:Much better.. Keep practicing so you get the hang on the right amount of heat. A properly done joint has no voids of missing solder. The entire joint fills.
I hope you got the pipe that nice and shiny before you soldered it. Flux is there to prevent oxides during soldering. It won't properly remove the heavy oxide on your "before" pipe. The joints need to be clean and bright before soldering.
I did the same with the inside of the fitting, of course.