Fix a Water-Stained Ceiling

The stain is the easy part. The leak above is what actually needs fixing — find it first, or you're painting over it again in a month.

Difficulty: Easy Time: 30 min work · 4 hr dry Cost: $15–$25
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Find the leak FIRSTA fresh ceiling stain means there's an active leak. Investigate the floor or attic above before painting. Common culprits: failed caulk in the bathroom above, ice dams, roof flashing, a slow plumbing leak.

Tools

Materials

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    Shellac-based (Zinsser BIN) or oil-based (Zinsser Cover Stain) — water-based primers won't block tannin or smoke stains from bleeding through.
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    Match existing finish
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Steps

  1. 1

    Confirm the leak is fixed

    Touch the stain — if it's damp, the leak is still active. Stop and find the source. If dry, proceed.

  2. 2

    Sand and clean

    Lightly sand any peeling paint, vacuum off dust.

  3. 3

    Spot-prime with stain blocker

    Roll or brush a generous coat of shellac-based primer over the stain, extending 2–3" past the visible edge. Let dry per the can (usually 45 min for shellac).

  4. 4

    Topcoat

    Apply ceiling paint over the primed area. For best blending, paint the entire ceiling — partial repaints often "flash" because the new paint sheen is fresher than the old.

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