Marking Metal Laser   Laser Metal Marking    
Comparison
Video Sprays LED

Omtech No Scent above 40 percent   60mms max speed?
Brilliance above 40 pct
Cermark has Scent and Sputters Needs lots of power.
CRC 3084 2 coats and clean with alcohol.  Remove with sand paper. Run 2 operations.
Dry moly lubricant can be used with a laser cutter to mark metal, and is widely available at auto parts stores. It's also cheaper than Cermark, and can be used to put logos or printed text on metal enclosures or milled pieces. 
Here are some products to choose from: 
CRC 3084 Dry Moly Lube, (Net Weight: 11 oz.) Dark Gray, Original Version
Amazon.com
Ebay
$15.29
This dry film lubricant is fortified with molybdenum disulfide, and reduces friction and improves overall operating performance. It bonds instantly to metal surfaces to form a dirt repelling barrier, and can withstand temperatures up to 650 degrees F, extreme pressures, water, and chemical attack. Reviews note that it's effective, and one reviewer says it's like paint but is a lube.  
… 
Sprayway - SW463 - 16oz Aerosol Sprayway M3 Dry Moly Film Lubricant gooey ?
Neobits.com  CASE    SINGLE
Ebay
$194.95
This dry moly lubricant is non-corrosive, non-conductive, and waterproof, and can be used on metal, wood, rubber, plastic, and glass.  
Sale
Sprayon LU200 Dry Film Moly Lubricant SC0200000
4.6(9)
PrimeBuy, + more  Amazono
$200.90$264
This dry film moly lubricant is a high solids, molybdenum disulfide coating that withstands high pressures, and bonds to all clean surfaces. It's also non-conductive and has a low coefficient of friction. Reviews note that it's effective, and one reviewer says it works just