I have good luck using plumbing solder. Only put the flux where you want the solder to go, so the job dosen't look like crap. You only need the solder in the joint. Clean the pieces you are about to solder with a piece of sandpaper, and do not touch the joint after you clean it. The oils from your fingers will give a weak joint. clean the flux off with alchohol after the piece cools to prevent rust.