I recently picked up a custom job engraving on stainless steel. the results are really good. In my 25 watt versalaser i used 100% power and 20% speed. however my third attempt using cermark on glass was almost successful. I ran the glass at 100% power and 10% speed. Only some of the black fused with the glass, maybe slower speed like 5%.
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Jason jenkins
ULS versalaser 25watt, coreldraw, adobe CS5, AutoCAD 2005-2012, photograv 2,