Is there a special method of painting over a water stain, after my boiler leaked through the ceiling?

Question

It's had a few months to dry and I've tried several coats of paint. It is still showing through!! Please help!!

Answer 1

cheap way brush or roller some gloss paint over the stain

when it drys emulation over it

or if you get some pva glue do the same with that

Answer 2

Paint over the stain with a sealer product and reapply a coat of fresh paint. This should take care of the problem.

Answer 3

You must use a stain block sealer to keep the water stain from coming through.

Shellac based sealers are best for this, BIN by Zinnser is one of the major brands, there are several generic versions that work just as well -- just make sure it is a shellac based.

If you can't find a shellac product, an oil based sealer would be a second choice, Kilz being the major brand there.  Make sure you get there stain block sealer, not one of the other primers they make now.

I prefer the shellac because it does not build up a thick film or leave a texture.  It will stick to nearly anything and block all stains.  It is also a bit easier to work with, but you will need household ammonia to clean up with.  

You will probably be able to see the stain through the sealer after you apply it.  This is fine, the sealer doesn't need to cover the stain, just keep it from leaching through the next layer of paint.

Answer 4

You can either buy a tin of stain block and cover the stain with this or use some undercoat for gloss paint. Once completely dry repaint the whole area with a couple of coats of emulsion and it will be fine.

Answer 5

If your gonna emulsion your wall or use any water based paints for that matter don't try and cover up the stain with PVA, if you do and then paint over it your paint  will run straight of the wall, PVAing is a daft idea. You can buy stain block which is designed for your needs its about 8 quid for a small tin, or if you have any gloss/oill based paints lying around use them and save yourself some cash. They will work just as good at covering the stain, then you can go over them with whatever you like.

Answer 6

Absolutely!

Answer 7

I would use PVA or gloss paint to seal the area before repainting.

Answer 8

Yes you will need to seal it. You can buy a sealant use an oil based varnish or PVA. I would give  the stain couple of coats and that should do the trick!

Answer 9

Paint over it with an oil based paint first,Brilliant white undercoat allow to dry then emulsion over it,

Answer 10

Your stain will keep coming through any water based paint.  PVA is water based and it will come through that too.  You use any oil based paint to seal the stain back.  Proper decorators will use an undercoat as is has a matt finish - noone wants to be emulsioning over gloss.  Professional 'stain blockers' are unecessary and often don't work as well as undercoat - which has worked for me everytime in thirty years.