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My drywall was wet before due to a leak. It has a stain mark. But after 5 coats of white paint from Behr brand and Kilz primer, the yellow stain is still bleeding thru

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In the past, I remember I had to scrape off the paper and put new mud/sand again. Then prime, paint.

Now it is all done already with texture and paint. Is there a better way to fix this?

I am thinking about getting the white color from Sherwin Williams but I am not sure if it does any difference.

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  • are you confident the spot is dry and no longer impacted? One of those issues where you are sure it is resolved, but it isn't? Just worth mentioning.
    – noybman
    Commented Jan 30, 2020 at 5:31
  • @noybman Yes the roof leak has been fixed and other side of drywall open to monitor for 2 weeks. So unless the old moisture is still there...
    – HP.
    Commented Jan 30, 2020 at 5:33
  • I would presume a heavier quality primer & paint could work but its definitely not certain. Killz has worked for me, and not worked for me. I've had inconsistent results the few times I had to cover a stain.
    – noybman
    Commented Jan 30, 2020 at 5:37
  • @noybman I had this happened 2 times before. One was not a leak but some stain in kitchen ceiling probably due to old drywall. That was so stubborn that I had to rip the paper and re-mudded it.
    – HP.
    Commented Jan 30, 2020 at 5:39
  • There is a barrier paint available, but I have also used a white craft type glue which dries clear with success.
    – Solar Mike
    Commented Jan 30, 2020 at 5:45

1 Answer 1

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Fortunately there are not many things that are soluble in both oil and water.

If it's a water stain use an oil based undercoat, or a shellac based sealer.

If it's an oil, grease, or wax, stain use a water based undercoat.

Use two coats of undercoat to get a good seal.

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    Shellac base gets my vote, after my grandfather passed we tried painting his room (heavy smoker) to make a long story short after using a shellac based primer sealer the tar quit bleeding through. Zinsser has a really good one but it is ~45$ per gallon.
    – Ed Beal
    Commented Jan 30, 2020 at 14:39
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    +1 for Shellac. Absolutely you need the Zinsser shellac, I would then give it two coats of a good BONDING primer, then paint.
    – Alaska Man
    Commented Jan 30, 2020 at 17:36
  • Indeed that was the stuff I was thinking of.
    – Jasen
    Commented Jan 30, 2020 at 20:06

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