just get exterior white and a 1" PVC pipe (what ever length you want the dip to be) + 1" cap + 1"x3" reducing fitting + 3" coffee can cover,,,, leave paint in tube with coffee can cover over 3" opening should last a bit....
make two especially if you want to build up the mass weight!!!! the 2nd is long enough to dip a full length shaft so you can seal over the dip one or two times depending on how much arrow weight you want to build up.
drill a 1" hole thru anything so you can put these tubes in so you don't have to secure them.