Similar to our other cast acrylics, an initial engrave will result in that chalky/dusty look. You can either do a light initial pass followed by a second pass with the engrave or you can also attempt to buff it with Novus 2 followed by Novus 1. However, it will still have an engraved look meaning it will appear like a matte/dull black. An engraving will never result in a pure glossy black finish. To get that effect you could try adding a sealant, wax, or paint fill. Please let me know if that helps you out or if you have any other questions.
Picture of customers "Dull" engrave. Most Glowforge customers have success cutting on the Proofgrade Medium Black Acrylic setting and engraving on the same. Some customers remove the masking before engraving.
Picture of product tested on Glowforge using Proof grade settings. 
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