Pc the whole valve cover the color you want the letters to be and 1/2 to 3/4 cure. Pc the second color and using a damp finger or the cheap foam paint sponges remove the powder from the letters an full cure.
I'd post a pic for you ,but this site sucks arse to post pics on. Shoot me an e-mail at
harleydad@new.rr.com and put "2 color valve cover" in the subject line. I'll reply and attach a pic.