Paint & Finishes

Stain Blocker

"A primer formulated to seal in stains (tannin, water, smoke, rust) so they do not bleed through the topcoat. Shellac, oil-based, and high-acrylic formulas are available."

American English entry — uses US spelling (color, gray, favorite, neighborhood) and US units (sq ft, gallons, ZIP code). Optimized for homeowners and painting contractors across the United States.

Color definition in detail

Zinsser BIN (shellac) blocks the widest range of stains; Zinsser Cover Stain (oil) handles tannin-rich woods like cedar and redwood. Always spot-prime knots and stained areas even when general priming is not required.

Synonyms & Related Color Terms

Stain-killing primer Blocking primer

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