System. 3 clear coat Fred. Epoxy soaks in fast in a warm microwaved or oven heated plug. No need for thinning this product IMO. It is very thin to begin with. I use a pipe cleaner thru the thru hole and wipe off any excess epoxy with a paper towel after a few minutes. Just a messy process so have everything ready to go. Fumes on a warm plug are not very nice for several minutes after application so an exhaust fan is a plus. Personally I have not had any issues sealing birch with the spar concoction as I prefer birch over maple and use that for a few of my darters or AYC.
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