Originally Posted by
northernontario
I redid the lights on my boat trailer this year. New wiring, ground to each brake/turn light... soldered all joints and sealed with hot glue + heat shrink. Dab of hot glue, let it set up a bit, slide heat shrink over the joint, then use a heat gun... heat one end, let it shrink and harden up, then heat along the length... glue will remelt in the joint and squish out the end of the heat shrink as it contracts down the length. Same as the double-layer heat shrink, but a heck of a lot cheaper. The small craft-type hot glue guns are best, as the glue is a lower temp melt point. Larger glue guns run hotter and low-melt glue will run everywhere.