Shellac is the only finish that is also the best primer. Dewaxed shellac bonds to virtually any surface — bare wood, old paint, metal, plaster — and accepts virtually any topcoat. It seals knots, odors, and bleed-through. As a finish in its own right, amber shellac applied in multiple coats produces the warm, amber-gold sheen of traditional New England interior millwork that no polyurethane or varnish replicates.
Amber shellac produces a warm, honey-gold tone that enriches wood without yellowing it unpleasantly. The finish has depth — it is not the flat plasticky sheen of polyurethane — and it polishes to a smooth, almost glassy surface that feels right under the hand. White (blonde) shellac is water-clear and does not impart color. Both are appropriate in traditional interiors depending on the desired tone.
Shellac is the resinous secretion of the lac insect (Laccifer lacca), dissolved in denatured alcohol. It is sold as dry flakes — the most stable form — or as pre-mixed liquid in a specified pound cut (the weight of shellac flakes dissolved per gallon of alcohol). Two-pound cut is the standard working viscosity for finish coats; one-pound cut for priming and sealing. Zinsser Bullseye Shellac and Zinsser BIN are the standard pre-mixed products. Shellac flakes from Liberon or Rust-Oleum are available for mixing to custom cuts.
Shellac dries extremely fast — touch dry in 15 to 20 minutes, recoatable in 45 minutes. It is not water-resistant — a wet glass will leave a ring. It is not heat-resistant — a hot pan will soften it. For surfaces subject to water or heat, shellac is a primer, not a topcoat. As a topcoat, it is correct for trim, millwork, furniture, and floors in low-moisture areas.
Shellac is the historically correct finish for interior millwork in traditional New England buildings through the 19th century. It is also, practically, the best product available for sealing knots and bleed-through before painting, for priming previously painted surfaces of unknown composition, and for re-coating old shellac finishes where compatibility with existing finish is uncertain.
Zinsser Bullseye Shellac (amber or clear) from paint dealers. Shellac flakes for custom mixing from Liberon through specialty finishing suppliers.
Amber shellac, two-pound cut, applied in three coats with light sanding between coats, for interior millwork and trim on traditional New England buildings where a warm, traditional finish is the specification. Dewaxed shellac (Zinsser SealCoat) as a universal primer over problem surfaces, knots, and old finishes of unknown composition. Water and heat exposure: topcoat with varnish or lacquer over the shellac base.
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