The lead free stuffs not that bad. You do need a hotter tip. It's increasingly hard to find leaded solder and more difficult to dispose of legally. For manufact

The lead free stuffs not that bad. You do need a hotter tip. It's increasingly hard to find leaded solder and more difficult to dispose of legally. For manufacturing it's been phased out for 15-20 years. I've never used bismuth based solder. Have read that it doesn't mix well with lead based solder. Last time I looked it wasn't available in flux-core. But appears to be now. The lead/tin/antimony solder I used to use in the 80's was pretty nice.