Has anyone here ever tried laser engraving stainless steel faceplates to label them?
The only way to do it is to use a spray like Cermark (Dry moly lube). You can not engrave metal with a 40W CO2 laser. The laser will cause the cermark to bond to the metal, that is how it marks it.
Thanks for the info @funinthefalls . Do you know if the moly lube will clean off easily without damaging the look of the stainless steel?
@Jonathan_Ransom yes it will
Yup, lots of people do it all the time.
Thanks guys. Wanting to label cat6 faceplates to make them look nicer than slapping on sticker labels. I don’t have a laser yet. This may be the reason i needed to justify getting one. 
You’ll want DRY Moly lube - not the wet kind. The wet will never dry enough to fuse well. Also, the Dry Moly Lube (CRC is the brand I got from Amazon) is about 10% the cost of the comparable Cermark/Thermark spray ($11 vs $100).
Yeah, I second “not the wet kind” as I purchased some wet moly & it barely marked the surface (as the air-assist kept blowing it around). I used an industrial Dry Moly lube for tests so far & it works wonders. Cleans off very easily (just wipe with cloth/water). Just make sure whatever you get has MoS2 (Molybdenum Disulfide) present in the mixture.