| abstract |
Staining and discoloration of painted wood surfaces, as a result of bleeding into the top or finish coat of soluble coloring matter and tannins naturally present in the wood, is prevented by coating or impregnating the wood with a basic aluminum compound, particularly with a water soluble basic aluminum halide or derivative thereof. The basic aluminum compound may be applied in aqueous solution or non-pigmented emulsion for prefinishing building lumber, or applied in the form of a pigmented emulsion as a primer coat. |