I use white gasket lacquer on wood but I'm now using white appliance epoxy enamel on aluminum. I tape the shaft where I want the cap to end and put it in my cresting jig. Light coats of the spray can while the shaft is turning works great. It did take a couple shafts to figure out how much paint so I didn't get runs. I then take the shaft out and hang like normal. This stuff is extremely tough! Cresting can be done with ANY paint. I have not tried to dip over the finish crest but I don't seem to need to. Very tough stuff. Dick