Paul it depends on the epoxy if it needs to be thinned or not. System three clear coat you can get away with not thinning it because it is already thin. That is how NIB seals his rock maple darters. I have done it and it does add weight to birch plugs. I think it does a nice job penetrating and sealing and also hardens it. I compare it to what propianate does.
you will see the epoxy wick right into the plug and disappear, then you put more on. It's pretty easy. I wouldn't thin envirotex or any thick epoxy, try to use something already thin.
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