Flux: The most important part of soldering is adding flux. it will make the solder process smooth, clean, fast and easy. Those who don't use flux are always the ones posting about problems they are having. Always use flux when soldering. Let me repeat this again ALWAYS USE FLUX WHEN SOLDERING !!! I personally use a Chemtronics No-Clean Flux Dispensing Pen - but its not cheap and is used mainly by pro's. You can use most kinds of Flux paste too. USA - Radio Shack: http://www.radioshack.com/product/in...ductId=2049774 UK - Maplin: http://www.maplin.co.uk/Module.aspx?ModuleNo=33849