Brilliant. Here you can see the solder seal connectors first shrinking, then melting, then soldering. In practice these soldering joints aren’t quite so magical, but they are pretty darn close.

We put the SolderStick waterproof solder wire connectors to the test on an RC plane build! See how these heat-shrink connectors perform under real conditions and why they’re a go-to for secure ...

If this doesn’t happen and a blob of solder merely encapsulates both wire and bucket, the mechanical strength of the solder blob alone is not usually sufficient.