Solder seal wire connectors for automotive use - worth a try?

I don't know about you guys but between aftermarket gauges for tach, oil pressure, temp, etc. and the addition of electric fans, fog lights, etc. I have had to join a lot of wires.

While I would prefer to solder all of these connections, that's not always possible, especially when trying to join wires under the dash where you'd almost certainly drip molten solder onto your face. Maybe you guys have a better technique for this but I find it to be a pain in the butt connector. :D

The solder seal wire connectors are a small section of shrink tubing with a ring of solder in the middle. Wires are inserted into the tube (there may be a specific technique for this...) and heat is applied and supposedly you end up with a good solder joint that's protected from the elements.

Has anyone tried this? Would you attempt to use these in the engine bay or under the dash? It seems like the low temp solder would need to be kept away from exhaust manifolds/headers but it might ne acceptable elsewhere...

Image "borrowed" from Amazon:
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