Painting plaster - Primer vs mist coat?
Discussion
I've had a plaster in the last few days doing half the house, but I'm planning to do the painting myself. I've always used a mist coat of diluted paint on fresh plaster before, be he's recommended using a primer first. The one he knows, and has pointed out for me on the local DIY shed's website, is clear, but he reckons you can get pigmented ones too to reduce the number of coats of paint it needs over the top.
Anyone got any experience of primers vs mist coats? There's a paint specialist not that far away so will enquire there too.
Anyone got any experience of primers vs mist coats? There's a paint specialist not that far away so will enquire there too.
mart 63 said:
Primer!! WTF is going on these days.
My local DIY sheds own brand white primer is on offer at the moment for €5.40/litre compared to €4.50 for a Histor emulsion that says it can be diluted, so a bit more expensive but not crazily so. Tempted to just go with a mist coat as that's the way I've always done it in the past.
I’ve done a fair bit of new plaster recently.
Mist coat plus two coats of proper trade paint from a decorating centre (I.e. not the cheap watery “trade” paint from a DIY shed) has seen it sorted.
According to a decorator who wanted some similar work he’d need to do five coats to get a good finish on fresh plaster.
I do however hate mist coating.
Mist coat plus two coats of proper trade paint from a decorating centre (I.e. not the cheap watery “trade” paint from a DIY shed) has seen it sorted.
According to a decorator who wanted some similar work he’d need to do five coats to get a good finish on fresh plaster.
I do however hate mist coating.
LooneyTunes said:
I do however hate mist coating.
The mess? I have a roller with a guard on it that does a pretty good job. The main thing I hate with painting is all the prep work. This is over 4 stair wells so I either need to cover the entire house in dust sheets or do one floor at a time and accept that I'll need probably 3 or 4 days per floor to mask it all up, do a mist coat, caulk the edges and do couple of coats of paint.RizzoTheRat said:
LooneyTunes said:
I do however hate mist coating.
The mess? I have a roller with a guard on it that does a pretty good job. The main thing I hate with painting is all the prep work. This is over 4 stair wells so I either need to cover the entire house in dust sheets or do one floor at a time and accept that I'll need probably 3 or 4 days per floor to mask it all up, do a mist coat, caulk the edges and do couple of coats of paint.Tbh I usually do most of my painting (aside from cutting in and gloss work) with a roller on a pole and a deep paint kettle. It is much quicker but mist coat tends to run everywhere. Usually throw on a disposable suit with hood and goggles whenever I need to mist.
I am redecorating our 20 year old new house.
This probably won't apply to your situation but I have a problem with the original paint coming off the wall and ceiling if I use masking tape and where it cracks off it leaves a paint crater which has to be filled and then painted.
The cause seems to be that the original plaster was polished up to a mirror shine and the original paint that was applied never adhered properly.
Interestingly my mate Roger Bisby on Skill Builder mentions the same problem this week.
Paint Flaking But No Damp? Here's the Real Problem
https://www.youtube.com/watch?v=5GBFeQFUXvs
This probably won't apply to your situation but I have a problem with the original paint coming off the wall and ceiling if I use masking tape and where it cracks off it leaves a paint crater which has to be filled and then painted.
The cause seems to be that the original plaster was polished up to a mirror shine and the original paint that was applied never adhered properly.
Interestingly my mate Roger Bisby on Skill Builder mentions the same problem this week.
Paint Flaking But No Damp? Here's the Real Problem
https://www.youtube.com/watch?v=5GBFeQFUXvs
Actual said:
This probably won't apply to your situation but I have a problem with the original paint coming off the wall and ceiling if I use masking tape and where it cracks off it leaves a paint crater which has to be filled and then painted.
That's exactly what I want to avoid with a decent mist coat or primer. My old house had similar, I took the wallpaper off and the paint underneath was really flaky. I ended up using a scraper to take all the old paint off, sanded the walls, applied a mist coat and then painted. Took bloody ages but still seems to be holding ok about 15 years later.Actual said:
I am redecorating our 20 year old new house.
This probably won't apply to your situation but I have a problem with the original paint coming off the wall and ceiling if I use masking tape and where it cracks off it leaves a paint crater which has to be filled and then painted.
The cause seems to be that the original plaster was polished up to a mirror shine and the original paint that was applied never adhered properly.
Interestingly my mate Roger Bisby on Skill Builder mentions the same problem this week.
Paint Flaking But No Damp? Here's the Real Problem
https://www.youtube.com/watch?v=5GBFeQFUXvs
Been there!This probably won't apply to your situation but I have a problem with the original paint coming off the wall and ceiling if I use masking tape and where it cracks off it leaves a paint crater which has to be filled and then painted.
The cause seems to be that the original plaster was polished up to a mirror shine and the original paint that was applied never adhered properly.
Interestingly my mate Roger Bisby on Skill Builder mentions the same problem this week.
Paint Flaking But No Damp? Here's the Real Problem
https://www.youtube.com/watch?v=5GBFeQFUXvs
In my case, half the paint came off easily.
Half of the other half came off after being softened by the new paint.
My neighbour is a painter decorator, he reckons the Mapei primer is good, better than a mist coat, particularly when the wall is a mix of new and old paster, or has patches of filler etc.
Some cheap emulsion has a lot of powder in it. This can get left on the surface when you dilute it into a mist coat..
PVA is OK, you need to dilute it, a lot, so it soaks in, not leaving a shiny skin on the surface.
The V in PVA is vinyl, as in similar stuff to vinyl paint, so like a mist coat with no pigment really.
I've used the waterproof variant of PVA on dodgy walls to good effect.
Like many things involving paint, it's how you use it, and choosing stuff that suits your technique in the circumstances.
OutInTheShed said:
mart 63 said:
PVA is a no no for new plaster.
Regards Mart ( painter for 40 years)
Havde you tried the Mapei or other primer?Regards Mart ( painter for 40 years)
What do you find happens with PVA and new plaster?
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