All of the above and more. It has a fairly short shelf life, requires the proper amount and type of flux, a carefully controlled temperature range to make a good joint, and a lot of practice to become proficient at hand soldering. The solder I use has the proper flux built in, keeps practically forever, and is more forgiving as to temperature range. Simply clean the wire, make a good mechanical connection, solder it, clean the flux off to stop further etching, and slide the heat shrink in place. Then turn off the iron and go on to the next job. I have the tools and equipment to place surface mount components (the primary use for liquid solder) but I would never use it on the stator wiring.