@JohnActon posted:Do they have flux in the solder ? What kind ? I would also be concerned with cold joints. j
John,
I don't know about the type of solder used but it melts beautifully with just a heat gun to provide a well-formed shiny, bright finish. I have no fears of a cold joint given enough heat. One brand of these shrink solder connectors now has 27,000 reviews on Amazon so this product is certainly gaining in popularity. I first starting seeing them used in amateur radio and marine applications a few years ago. Suggest getting a few of them, in different sizes and give them a try yourself. You just need a heat gun. I got mine on sale from Harbor Freight for about $12.