Review on Premium Kester 331 Organic Core Solder 63/37 .031 1 lb. Spool for Efficient Electronics Soldering by NTE Electronics (1) by Steve Campbell

Kester makes the best solder and this is no exception, it's top notch solder, it's a flushing flux and it smells like shit compared to Kester 44s flux but it flows, same melts very fine solder easily and is excellent, I would recommend you use a sponge if cleaning the tip between uses as this flux is caustic and needs to be washed off but otherwise great stuff.