i used th solder iron t oremove the coaring on the metal strips when I solder them. I also wrap them well with eletrical tape to prevent shocking.

To figure out were to place hte tape look both the tubs set in there and pick a middle area that will fix both of them with heat. I usesally run mine about 6 inches from the back to allow a sure spot for a heat zone. I found if i use the 3/4 inch flex I needed to run 2 strips side by sideot getthe heat level I wanted. cause the tubs and all cool off fast inthe room even with a space heater set to about 83 degrees.