I found this old thread, so thought I would bring it back up since I just posted a similar question before seeing this thread.
I am under the impression that the heavy density Penreco candle gel does not require a container. I could be wrong about this, but this has been my thought on what that product is for years ... I've just never purchased it. I gathered that you make them in a tear-away mold of some sort. Surely, I need to go do some reading on this, but if anyone here would like to share thoughts, that would be nice, as I am not doing any research on this just yet, as it's on a "back burner" !