Sorry, I'm with Neal on this one, I have been soldering for almost 30 years, not just RC hobby stuff I also used to do electrical repairs too. I have tried several lead free solders and found each one to be hard to work with, producing inferior results to standard leaded types.
As for a recommendation for a good soldering iron, I have had my 25w Antex for over 25 years (Ok Trigger, it did have a replacement element about 10 years ago), I have various tips for this but for RC usually use a 2.5mm tip. This is fine for anything upto motor wire type size, so most RC jobs are no issue. I think its only jobs like cell building where I have to break out a bigger iron. A good quality iron and they are not too expensive to buy, plus AFAIK they are still a British firm
