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Seal coat is dewaxed shellac and is alcohol(denatured)based and doesn't "mix" with mineral spirits.It is only guaranteed under clear coats for interior applications.Shellac simply is not made for any type of exterior application,it doesn't play well with moisture and temp changes.Using it as a sealer on plugs is asking for failure.
You need to use some type of oil based product.I personally like a 60/40 mix of Penetrol and Naphtha.It ain't gonna dry as quick as shellac but it will actually seal the wood.
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