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Make sure you get rosin core solder and not acid core. You can also get flux pens which are are less messy. I also clean both parts to be soldered with isoproponal (rubing) alcohol. After soldering I clean the joint with the alcohol and a small bru***o remove any excess flux. <br /> <br />Also if you move the part as the solder is solidifying you will get a bad (cold) joint. If you are not soldering rail but something small or where the parts are likely to move as you solder then try and get some 63% tin 37% lead solder. It's more expensive but goes from liquid to solid almost instantly as it cools so it's much harder to get a bad joint. It also melts at a slightly lower temperature although I don't think it's significantly lower.
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