I got a spool of Worthington 97/3 Rosin Core solder and have been using it for a long time. I've always had problems getting solder to stick. I just assumed my technique was bad. (to be fair, it probably kind of is) I recently built a project from a kit that came with a small roll of solder and it worked beautifully. I've never had a board look so good. My question is, what kind of solder do you guys use? Also, is there a reason the stuff I was using before refuses to cooperate so often?