Old damp ceiling patch-how to disguise

[Harden Long]

Hi

I had a bedroom ceiling re-plastered after a leak (which I thought had been fixed)

Disaster ! The leak wasn't fixed and although it is now, the nice new plastered ceiling has a big old damp stain on it

The ceiling was awaiting painting and I am hoping I don't have to cut out this patch and get it re-plastered but am wondered that it will still show through when painted over

Is there anything I can apply to the ceiling to avoid this??
Thanks

 

[Diyisfun]

Apply a seal coat using diluted pva

 

[Harden Long]

Thanks

Do I still need to do that even though the ceiling is now bone dry?

And also, how do I dilute the PVA-what ratio (do I use water and is PVA widely available in B and Q etc??)

 

[Growler]

PVA, will not seal your water stain, it will come through again.

Oil based undercoat will do for you.

 

[spice]

PVA, will not seal your water stain, it will come through again.

Oil based undercoat will do for you.

PVA wont touch it, and the cheapest and best IMO is what growler said, oilbased undercoat everytime.

Make sure you cover every inch of the stain though, leave to dry, and next day emulsion as normal, the stain wont bleed through.

 

[Harden Long]

Thanks-I know this is a daft question, but do I need to paint the entire ceiling with the oil based primer or can I simply go over the area where the damp stain was?


Would something like Dulux 1 Step Oil Based Primer Sealer & Undercoat do the job?

 

[Nige F]

yes, that`ll do .....just over stain + a margin and random pattern @ edges to "loose" the shape