i've got a few different batteries and even on my Lavatube battery it's the same. It's a pretty clean budder that worked fine in the Dart when I first got it.How old are your batteries and what sort of concentrate are you using?
The problem is I put a dab on the Rev and it doesn't even melt in at all. Seems like the Dart only melts in right now and bubbles a little but not much vapor. My last batch wasn't as clean so like I said, maybe the Dart could use a boil but the Rev is totally virgin.If you are seeing red, it must be heating but not primed correctly. Once the concentrate gets to the coil you will not see red anymore but vapor. You need more concentrate to melt in?