@flickyourbic Quartz is prone to micro abrasions on the surface and these will cause the black to appear faster since the dab is filling those micro abrasions that happen over time.
A new banger would definitely fix the issue you are seeing =)
@biohacker inserts are still a month or so out as we are preparing to move at the end of September and once moved I can focus on inserts and other items on my list of to dos =)
The Slurp-E has been doing well and the only complaint is its not as easy to clean as a traditional banger, but we all knew that would be the case =P
Shane