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Remember this is just a quick insight, there are a lot of specifics if you'd like to check this out. With the ratio of resin to microballoon mixture it is possible to achieve density similar to balsa all the way to sinking. So, if you have a plug that you make out of say, Maple or Birch, it would be possible to dial in that mixture, and not have to worry about water intrusion. Painting, not yet! One thing you have to deal with is "off-gassing". The best way to be safe here is to set them aside for about 3 weeks. If you begin priming right away you may have adhesion issues. Also, you most likely have some small pinholes in your casting. If you wish you can fill those with spot filler and lightly sand. I know many of you paint with Creatix or similar, I've been told that Krylon Fusion is a great adhesion promoting primer between the resin and those paints. I use automotive paints so I shoot an adhesion promoter, primer, then start with base coats.
Douglas
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