Hello,
I use cermark LMM-6038 rather than the LMM-6000 to laser logos, etc on the Yeti style cups. The marking comes out fine, but it turns out a small percentage of them loose their marking over the course of about a month. Could it be an issue with the the 6038 rather than the 6000? Is it possible to "over laser" the cermark when initially putting it on? Any other ideas?