Sealing an old ceiling

Question

I have a ceiling with stains on it, not sure if it is water or pee from furry creatures, can I seal it to stop the stain coming through again. With watered down PVA?

Simon · Accepted Answer

Unfortunately not , the stain will come through before the PVA dries. Zinser do some excellent stain blocking paints , both water based and shellac fast drying ones .

Georgiana · Answer

I recommend you to renew the ceiling. I don't know what kind of stains you have on the ceiling, but it might be mold, it's very dangerous for your health and the people in the house

Terry · Answer

No you must off had  some sort of leek
Check they no leak
Then stainblock it mate few times
With zinnzaer or 123 cover stain

Aniketkumar · Answer

Identify the Cause: Before sealing, try to determine the source of the stain. If it's water damage, ensure that the leak is fixed. If it's from animals, clean the area thoroughly.

Clean the Area: Use a mixture of water and a mild detergent to clean the stained area. Allow it to dry completely.

Use a Stain-Blocking Primer: Choose a high-quality stain-blocking primer, such as Kilz or Zinsser. These primers are designed to cover stains and prevent them from bleeding through the paint.

Apply the Primer:

Ventilate the Area: Ensure good ventilation if you're working indoors.
Prepare the Surface: Lightly sand the area if needed to ensure good adhesion.
Apply Primer: Use a brush or roller to apply the stain-blocking primer over the stain. Follow the manufacturer's instructions for drying times and the number of coats required.
Paint Over the Primer: Once the primer is dry, you can paint over it with your ceiling paint.

Simon · Answer

Any water based paint will pull stain through, Zinnser “bin” stain blocker is the best, cover stain with this first then paint ,

Joseb · Answer

Zinserrs cover stain is great product. Then use your normal paint when its dry.

Grant · Answer

I wouldn’t recommend pva use a trade rated stain blocker this is more suitable for the task. Hope this helps 😊

John · Answer

Hi don't  use pva as its a glue. Best option is to seal the ceiling with zinsser cover stain then emulsion over to finish. Hop this helps .

Antonio · Answer

In my opinion, first check if the stained area is damp or soft. If it is damp you will have to let it dry well, and then if it is not softened, I advise you to give it a coat of Dump seal and let it dry for 12 hours and if you then need to apply filler to even it out and only then paint it with normal paint.

Paul · Answer

Use. stain block. You can spray it on.from BQ
Sometime you require spraying it twice.2 coats

Sealing an old ceiling

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