Paint cracks that have loosened the paint around it.
Anonymous user 09/03/2024 - 3.05 PM
Can anyone shed some light on this as I am worrying slightly..
Had living room and dining room decorated after being plastered.
Plaster was mist coated with 60/40 ratio of either crown covermatt Obliterating emulsion or machpershons eclipse with water then another coat of around 90/10 . I then proceeded to use my top coat which was crown clean extreme Scrubbale mat. Bloke at crown told me it would be fine to apply straight to a mist coat.
Further decorating adding rads/skirting boards has brought out some Cracks in the paint which I thought would be normal. I filled the biggest ones around the rads with easifil and painted round a few.. however some have reappeared around the rads and if I push my finger around the paint it literally pushes in, I am now extremely worried that it means that the paint hasn’t adhered to the wall or previous paint. Or is this normal around a Large crack that is probably coming from the plasterboard behind it being damaged. Not really sure what to do, quite worried that it is going to happen all over the walls! Any suggestions would be greatly appreciated
Edit: Thanks for the replies. It was 60 paint 40 water first coat for the mist, then 90 paint 10 water for the second coat I might of even done a third however I can’t remember, I was of the assumption that only one mist is needed. I did ask the guy at crown wether I should thin the first coat of clean extreme and he told me not to as it would affect the paints scrubbability. That’s exactly what it looks like that the area around the crack the paint has come away from the plaster And is sort of not laid on top. Any remedies around this? As I think scraping the paint of might create a rod for my own back
Edit, does this confirm my fears that it is going to happen all over the walls? I am having zero luck with this whole decorating, it does feel pretty solid around the room just the parts where large cracks have appeared
Edit: what do I do with the product you suggested? Zinsser? Do I paint it over the cracks then apply the top coat paint over that?
Edit so inspection around the room there are multiple hair line cracks in the paint. This is really bugging me because I tried to make sure I done everything correctly having failed a mist coat last time. Can anyone shed some light on how to proceed or do o just have to live with them?
Are you a tradesperson and able to answer this question?
During plaster work . By not letting the cement plaster completely dry before applying paints is a common factor to peeling paint and hairline cracks.2' poor paint job , missing out layers or not letting previous paint completely dry can undo your overall efforts. Also contraction and expansion fluctuations in humidity levels and temperature changes can cause hairline cracks to appear.3' use high quality products such as Zinssar peel stop primer paint.It might hurt a bit now but it's better in the long run.
Answered16 November 2019
2
Anonymous user
Prior to mist coating, I normally apply a watered down mix of pva to seal the plaster, let it dry throughly, then mist coat let that dry, top coat as per normal with various coats of your chosen paint.
Hi. It's not really viable to give any precise answer on here with a problem like this. There is no substitute for seeing the problem first hand.
I will say that as regards mist coat 60/40 what was 60, what was 40.
Mcphersons eclipse should be diluted with around 30% water each coat.
New plaster that has been mist coated is still very absorbant, 'warm' we say in the trade.
Mist coating does not 'seal' the plaster as often claimed here.
I always advocate easing the first coat of final emulsion, makes application easier and avoids any problems with the drying and setting of the paint.
It sounds that whatever has caused these cracks may have loosened paint from the plaster, the addition of heat from the radiator exacerbating this.
I would't say however that what you have done with your painting should cause any problems elsewhere.
Hi Beechy17,
The reason why this has happened is you have painted over plaster which has not fully dried. This happens because the moisture is still trying to escape so pushes the paint off to allow for this. Once the radiator was installed this would of further exacerbated this problem. To fix this, give the walls further time to dry, scrape off as much loose paint as possible. Give a good sand and ensure all hard edges of the paint are smoothed off and reapply.
Answered24 February 2020
0
Anonymous user
Difficult to answer this question without seeing the problem but I would suggest a few potential problems with what I have read in your question. The first thing that sprung to mind is that the plaster could be still damp in which case it needs sufficient time to dry out before applying any paint (anywhere from 4 to 7 days) 7 to be on the safe side and it is still very porous. The cracks in the paint have appeared either because the surface is still damp, or not mist coated correctly as the wall is drawing moister from the paint before it dries not allowing it to bond to the surface. Or it is not binding because it is still damp.
Either way, the solution I would suggest would be to allow the wall to dry out fully. Before sanding back areas where the paint has a cracked and reapplying a coat of emulsion, and then further coats as required after the previous coat has dried.
The other potential issue is the scrubbable paint which makes me think the wall is still damp. Scrubbable paints are a vinyl emulsion and won't help moisture that needs to escape for the wall to dry out. I would advise not to paint on any damp surface, especially with vinyl paint. Fresh plaster must be dry and properly mist coated. Do not as someone suggested apply PVA to damp plaster sealing the wall will not allow it to breathe and could cause future issues with dampness.
I am not sure if you are painting on fresh plaster or plasterboard which makes giving an answer very difficult, but I hope this helps in some way.
