Some PCB's are not compatible with lead-free solder. So if Some PCB's are not compatible with lead-free solder. So if you are already using lead-free solder please ask your PCB supplier if the PCB is ready for lead-free soldering. More informations about problems regarding lead-free soldering: Stannol forum: http://www.stannol.de/phpBB2/index.php Stannol homepage with informations for lead-free soldering ("lead-free" in the navigation): http://www.stannol.de/Englisch/index.htm In a thread in german Stannol recommends to use soldering irons with 80 W or more for faster soldering. Reason: With 50 W soldering irons the tin-solder will melt, then the temperature falls, then it gels and needs additional 1-2 seconds to melt again. Hobbyists may live with that. Lead-free joints are matted. That seems to be normal. In another Thread (also in german only) Stannol recommends the use of a special tip cleaner for lead-free soldering. If you don't use it regularly you will get a black tip!