Ok so I have started soldering my circuit but it isn't going very well. I have a 50W iron and lead free silver solder, Basically when the iron melts the solder it doesn't stay on the iron or board but forms a small ball that rolls off.... So I need some flux, is this stuff suitable? http://www.amazon.co.uk/LA-CO-Regular-Soldering-Flux-Paste/dp/B002OB4CIE/ref=sr_1_1?ie=UTF8&qid=1333789476&sr=8-1 This is the solder: http://www.maplin.co.uk/lead-free-silver-solder-34965 This is the iron: http://www.maplin.co.uk/50w-solder-station-35016