Review on SolderSeal Brand - Premium Solder Seal Wire Connector Kit 120PCS - Aiding Your Wiring Projects - No Crimping Required - Effortless Heat Gun Application - Water-resistant - Insulated - Ideal for Marine and Automotive Applications by Michael Hogate

I liked that the product has both soldered wire connections and sealed heat shrink tubing. However, I did find that on some connections, when the solder started to melt, the solder had melted through the shrink tubing, tin the wires and made the connection. This forced me to glue the joint, so I bought a "Solder Wire Kit" to avoid that. I sealed the connections with Tesa tape to avoid cable problems. I've seen other kits say they lowered the solder melting point of their connectors. However, they didn't come with the connectors I needed to work with the small car stereo cables.