Laser Etching Painted Aluminum Plate

I have had good success by painting the aluminum first with Bullseye 123 Primer and then a coat of whatever light color of Rustoleum 2X spray paint I want for the end result. When dry use my JTech 2.8 w laser running at about 75% power at 20 inches per minute to burn the text. Without touching the burns (it will smear) I then hit it with a Rustoleum 2X Clear Gloss and it locks it all in. The text comes out sharp and dark.