That is what I did I bought the caps I wanted off Ebay (originals) some painted a couple chrome and then I used Appliance Enamel designed for painting appliances, tough, looks good and comes in a nice white. The I masked and sprayed the letters using vaseline,and tape. Final prep with toothpicks, let it dry about 5-minutes and then pull tape, carefully wipe off the vaseline final cleanup done with round double pointed toothpicks.
Don't have a close-up but they turned out good.
http://community.webshots.com/photo/2693530320102454676QwJfhG