Ceiling water stain bleeding through paint
Tools: brush, roller, step ladder, dust sheet · Materials: shellac- or oil-based stain-blocking primer, matching ceiling paint
Steps
- Press the stain: if it is damp or soft, the leak above is still active — find and fix it before any painting.
- Once dry, do not paint emulsion straight over it — the tannins in a water stain bleed through ordinary paint every time.
- Apply a shellac- or oil-based stain-blocking primer over the stain and 10 cm beyond it; a spray can is fine for small marks.
- Let it dry as the can says, then apply two coats of ceiling paint over the whole area to blend the sheen.
Stop and call a pro if
- the stain grows or reappears wet — the leak has not been fixed
- the ceiling board is sagging or crumbly
- the stain is under a bathroom or a flat roof and you have not found the source
What a pro does that you can't
A plumber or roofer stops the leak; a painter replaces damaged board, seals with the right blocker, and repaints the ceiling so the patch disappears.
DIY cost: $10–30 for a stain-blocking primer