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[Auto Addict]

Do I need to treat it, or can I emulsion straight over it?

[Marks DTM Calib]

Treat it with stain block or use some aluminium paint or it will bleed through the new paint.

[SIR Philbutt]

If you have any oil based paint that will act as a stain block (I use undercoat but gloss will do) then paint over with your emulsion (takes a couple of coats of emulsion to match)

Make sure you've resolved whats caused the stain.


HTH

[Terbs]

As both previous replies.
Both options will work satisfactory
And as previously stated....ensure the cause is repaired, and the stain is dry prior to painting.

[STEMO]

If you're going to use oil based gloss, give it a light sand before you apply the emulsion.

[Terbs]

No need, Steve, if you put it on inside out

[Gaffers]

Next time, take a p!ss BEFORE you swallow the blue pill

[STEMO]

No need, Steve, if you put it on inside out

Of course...but you need a back to front brush for that.

[Terbs]

No need, Steve, if you put it on inside out

Of course...but you need a back to front brush for that.

Quite cheap in B and Q

[STEMO]

No need, Steve, if you put it on inside out

Of course...but you need a back to front brush for that.

Quite cheap in B and Q

Emery paper is cheaper. I once used a back to front brush by mistake and ended up with a very dull door. 

[Terbs]

That's not a mistake, but negligence. How can you mistake a back to front brush...its bristles are inside out, totally different colour

[Terbs]

For those who don't know...this is the difference.....

[Kevin Wood]

Must be a cheap copy, that. They've not put the writing on back to front.

[Terbs]

Must be a cheap copy, that. They've not put the writing on back to front.

 

[Seth]

Wash with sugar soap first Baz, then do the whole ceiling in this:



When dry, overcoat with a coat or two of matt Dulux Once


http://www.screwfix.com/p/zinsser-cover-stain-primer-white-2-5ltr/17117