I use Valoil/MS, Larry. Do you build with soft maple? AYC, pine barely absorb any sealer, and I only seal for an hour or two. Soft maple (and birch) are different, they suck the stuff up. They suck water up, too. And they split. The more sealer you get in them, the less room for water, the less water, the less expansion and contraction, the less movement, the less splitting (and less waterlogging).
I think sealing a plug is not about a thin coating on the outside (very little water gets absorbed perpendicular to the wood fibers). It is about building a barrier in the exposed end grain. Since maple transports water (or sealer) very quickly, my theory is that a quick dunk gets drawn in and doesn't seal much.
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