Technology1 min ago
Emulsion Blown And Peeling
I’m trying to re- emulsion a wall but some of the previous paint has blown and is peeling off the wall right down to the plaster. I can’t emulsion over as that makes it worse
Help please
Help please
Answers
Usually two things that cause this, Ric. Original plaster was " over- trowelled". Plasterers are often keen to "bulls***" the finish (technical term.) Most likely anywhere around mid to eye-level, so people can go up to it and remark on how wonderful the plasterer is. A shine is unnecessary. It prevents the paint from taking properly. The second thing is a...
17:41 Tue 06th Nov 2018
New plaster should be given time to dry completely - any patches that are darker than the majority of the surface area is deemed to not be so. Once dry, a light sanding is advised, followed by a mist coat of white matt emulsion - thinned with 10% - 15% of water, well mixed. This seals the new plaster and allows the first coat of silk vinyl to take hold. A second coat is then much easier to apply.
If the plaster where the problem occurs is dry, sand it down, paint the area over with a mist coat allow to dry before applying top coat.
If the plaster where the problem occurs is dry, sand it down, paint the area over with a mist coat allow to dry before applying top coat.
Usually two things that cause this, Ric.
Original plaster was "over-trowelled". Plasterers are often keen to "bulls***" the finish (technical term.) Most likely anywhere around mid to eye-level, so people can go up to it and remark on how wonderful the plasterer is. A shine is unnecessary. It prevents the paint from taking properly.
The second thing is a first coat that's far too thick. Ken's right about the "mist" coat. With thick, trade paints it's better to thin even more than the manufacturers say. Maybe 20% water. This coat should not cover. It's Ok to actually see through it. Subsequent coats can then be full ones.
Nothing for it but to attack it with rough sandpaper and scrapers to remove ant other paint that wants to leave the wall. Feather the edges of the remaining paint, then either seal with dilute PVA (not really the best way, as walls shouldn't be sealed...........
or .............. put on a new mist coat.
Original plaster was "over-trowelled". Plasterers are often keen to "bulls***" the finish (technical term.) Most likely anywhere around mid to eye-level, so people can go up to it and remark on how wonderful the plasterer is. A shine is unnecessary. It prevents the paint from taking properly.
The second thing is a first coat that's far too thick. Ken's right about the "mist" coat. With thick, trade paints it's better to thin even more than the manufacturers say. Maybe 20% water. This coat should not cover. It's Ok to actually see through it. Subsequent coats can then be full ones.
Nothing for it but to attack it with rough sandpaper and scrapers to remove ant other paint that wants to leave the wall. Feather the edges of the remaining paint, then either seal with dilute PVA (not really the best way, as walls shouldn't be sealed...........
or .............. put on a new mist coat.
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