FWIW I find the waterproof/heat shrinkable butt splicers by Dorman to be great. When you shrink them with a heat gun there seems to be some sort of goop that melts and pushes the air out. Never had a failure yet. One thing to keep in mind, if there is air in your connection chances are moisture will get in, and trying to seal it out can result in trapping it in just as easily. A tightly wrapped connection with trapped moisture is worse than an exposed connection that can dry.
I've also used the solder seal heat shrink butt connectors that you don't crimp, haven't had a failure on those either but I have mixed feelings about the reliability of a solder with such a low melting point on a vehicle. I usually use them in 12 and 24 volt splices for undercabinet LED lighting.
Would be interested in hearing what @mrblaine has to say as I know he has a lot of knowledge and experience on methods and products for this, probably more than any of us.
I've also used the solder seal heat shrink butt connectors that you don't crimp, haven't had a failure on those either but I have mixed feelings about the reliability of a solder with such a low melting point on a vehicle. I usually use them in 12 and 24 volt splices for undercabinet LED lighting.
Would be interested in hearing what @mrblaine has to say as I know he has a lot of knowledge and experience on methods and products for this, probably more than any of us.
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