E-Wood is a two component epoxy wood putty that may be used to fill in wood voids. It can be textured to match the appearance of the surrounding wood. Hardened E-Wood filler can be sanded, shaped and stained. Coverage Rate: 1.8 cubic inches per ounce mixed A & B components. Size: 2 component 32 oz. package, 2 component 2 gallon package. More @Wikipedia
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