Quoted from Gizza:I've always felt that old solder was much better flowing than the new stuff. Being in Europe, what are my best options for good solder? Is all lead free solder bad or are there good brands? What should I look for?
If you require lead free, you should look for SAC alloy solder, it has the best rework characteristics. Make sure you are using the right soldering temperature: 371-427°C (700-800°F) Yes, it is more difficult to solder lead free - it just isn't the "same animal" as conventional solders. It isn't impossible, it's just different - and requires different techniques to hand solder properly. Adding additional liquid flux will help the process as well, try Kester 186 Mildly Activated Rosin Flux
http://www.kester.com/products/product/285-Flux-Cored-Wire/
http://www.kester.com/products/product/186-Flux-Pen