I use the white rustoleum primer. I mark the shafts at the cap line where I want it to stop with a permanent marker, just a small mark. I put the shafts in my crester, point end, spin the shaft as I spray. I use a piece of card stock, hold it in my left hand, with the nock end to my right, I put the edge of the card stock on the line just off the shaft, dont touch the shaft,( The small mark forms a line while spinning in the crester), then spray from the edge of the card stock to the nock end, moving smoothly and watching the coat of paint, I can lift the card away as I move away from the line. I can do it now in one pass. If the coat seems heavy, leave it in the crester spinning.It will set. I then crest with Testers. I dont seal it either, but I may this next batch to see how it works. I use Fletch Tite Platinum,No feathers falling off to date. I dont get that real abrupt line from the tape method, and if The line is off a little,cresting lines clear them up.. Good Luck, Brian