stay-brite is excellent there is no better but it's the flux that makes it work so well. i used there flux with at least 15 different solders and all of them worked excellent. there flux is like no other it's hydrochloric acid and that's the key. remember to heat around your soldering area, dont burn the spot where the solder is going to go. i use to be just like you guys and after a couple of years useing stay-brite, it's really the hydrochloric acid i can weld anything, i even weld aluminum but i don't use solder.