Trying engrave coated tumblers on my P2.  I am using the rotary attachment and the setup for that was no problem.

My question is about power and speed.  I cant get a shiny silver result even after cleaning off the tumbler when finished lasering.  I even tried final cleaning with isopropyl alcohol and magic eraser. The layout is good but the metal looks very dull.

I have tried different combinations of power and speed but no luck yet. Just ruining a bunch of tumblers…

Has anyone had any success ?