Test engrave on dry erase board from HD using Ortur laser master 3. I used one coat white rustoleum paint. Let dry for 1 hour and then follow up coat with 1 coat of Rustoleum black paint. Let that dry for 24 hrs before engraving.

Settings I used:
Speed - 7000 mm/m
Power - 5% min and 30% max
Dither

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