Hello, I received a call yesterday from a local customer that the jar cracked on one of the candles they were using as a tester in their store. Since they were local, I was able to run over to see for myself what the problem was. It appeared that the wick moved and was up against the glass. It made the label singe a bit and also shattered the glass. One thing I noticed was that there were about 5 matches in the jar! It looks like the store owner actually has been lighting the candles, then throwing the match right in with the wax. ???!!! I use a high temp glue gun, and haven't noticed this happening with any of my testers, and haven't received this feedback from anyone else. Now I am mildly freaking that I have candles out there that might be prone to having the wick move. I read one thread stating that the wick should extinguish itself when it gets to a certain point, but I've tested candles and see that they can burn to the point of most wax being gone. So, I guess that's one issue, and the other is the moving wick. I see that people use silicone, but up until yesterday, thought the glue gun was doing its job. I imagine glue dots would behave the same as the glue gun...