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Sealing wood knots

Bare wood with knots

Seal wood knots with White-Pigmented Shellac. Several coats may be necessary to seal each wood knot. A disposable or “one-use” paintbrush can be used to apply White-Pigmented Shellac. Allow drying.

Lightly sand the dried White-Pigmented Shellac with the fine grit-side of a sanding sponge, or 120-grit sandpaper. Remove sanding dust with a wiping cloth or towel before priming the entire piece of wood with an oil-based primer/sealer, or underbody primer. Allow drying. Lightly sand the dried primer/sealer. Remove sanding dust with a wiping cloth or towel, and then apply paint.

Painted wood with wood knots

Wood knots that have bled through dried paint should be sealed with White-Pigmented Shellac. Several coats may be necessary to seal each wood knot. Allow drying.

Lightly sand the dried White-Pigmented Shellac with the fine grit-side of a sanding sponge or 120-grit sandpaper. Remove sanding dust with a wiping cloth or towel, and then apply paint. Slightly dampening the wiping cloth or towel will help to control dust.

This information can be found on page 103 of the book:

The Homeowner's Guide to Surface Preparation for Interior House Painting.

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