Solder paste. Having made hundreds of solder joints with it, I haven't noticed a single problem reported with other solder pastes. It's a mixture of tin-lead bullets in a flux slurry, and the flux works well too. Regarding complaints about surface mount paste or flux, people often complain that boiling flux causes solder balls to fly all over the place. I haven't had this problem with this solder paste, whether it's my iron or heat gun. I lost the first pipe. It worked so well that I bought it again. And it appears to be a recent product meant to make a difference for things like this: I ordered mid-September 2019 and received a tube of noodles dated early September 2019.
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