Ok, after making container candles for a few years, I've got hooked on making pillar candles, I LOVE IT. I have a mold that holds 2 pounds of wax and was looking for something to plug the wick hole with (could'nt find my putty) Thought to myself, self why not use duct tape? DO NOT DO IT! Two pounds of wax all over the counter and floor in the kitchen! Glad wife did'nt throw a fit, guess she lokes candles too much to get mad. BTW the metal tape works well, it has a higher heat rating.