I went to a body shop supply house and talked with the owner about what I was trying to do with plugs. He gave me a autobody filler that I have been using on my last batch of plugs. Real easy to mix and use and sands down to a silky smooth finish. He said it is waterproof as well. Of all the things I have used, I get the best smooth finish out of the autobody filler and you cannot tell where the lead is on the plug once it is painted. One downside is the stuff stinks, you can get a buzz off the smell when mixing.
Maybe Mike FishingFreak can chime in on autobody fillers?
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