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Painting Mistake

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AKMild | 16:57 Thu 06th Jul 2017 | Interiors
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I'll be the first to admit that I'm not a great DIY-er, and true to form I have come a cropper on a very small painting job. It's a shower-room ceiling that I removed the existing flaking paintwork from and filled/sanded. I then wanted to size the filler/bare plaster with diluted emulsion as a prelude to painting. I found some white undercoat in the shed and proceeded to dilute it 50/50 and painted the ceiling with it. When I came to clean the brush I was surprised that the paint did not come off with warm water, and it turns out that I have used a solvent-based undercoat rather than an emulsion! Own goal!

Could someone advise me what I need to do from here to get the ceiling ready to take undercoat/topcoat of emulsion? I imagine it will involve letting the 'wrong' undercoat dry and then sand it off before sizing with dilute emulsion, but some advice from those in the know would be welcome.

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Emulsion it as normal. Before the invention of stain block, oil based undercoat was used.
Emulsion is OK on oil, it's the other way round is the problem, but in any case, just try a small area, - a couple of inches - overnight to see how it dries.
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Thank you both for your replies. I am much relieved.

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Painting Mistake

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