Completely ignore the "No Flux Required" part of the description. False advertising. I bought this to do some repairs on some aluminum parts and covers from old projects but a few connections I made before testing, the rod stuck to the base metal but just stayed on the surface no matter how hard I heated it. Share before or after. It will not expire during the connection period. I melted one part a little to try but it's still workable. Also, the tube I received was already open, and to make matters worse, some robes were 2-3 inches shorter than others. Watch out for local sellers beforehand.