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  • FIRST POST
    • britishboy
    • By britishboy 24th Jan 18, 10:46 AM
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    britishboy
    Fresh plaster - how many mist coats?
    • #1
    • 24th Jan 18, 10:46 AM
    Fresh plaster - how many mist coats? 24th Jan 18 at 10:46 AM
    we are due to begin painting our downstairs after it was plastered, how many mist coats will it need? I hear so many conflicting opinions. So far been told:

    mix of PVA, then top coat (ruled this out straight away)

    1 x mist coat 50/50 paint/water split, then top coat

    2 mist coats, 50/50 then 75/25 paint/water then top coat?

    Whats everyones preferred, or what will give the best results please?
Page 1
    • TheCyclingProgrammer
    • By TheCyclingProgrammer 24th Jan 18, 11:11 AM
    • 3,055 Posts
    • 1,760 Thanks
    TheCyclingProgrammer
    • #2
    • 24th Jan 18, 11:11 AM
    • #2
    • 24th Jan 18, 11:11 AM
    Tub of screwfix bare plaster paint, two coats with snagging in between. No mess or trying to the mix of water and paint right, no fuss.

    You are right to avoid PVA.
    • Grenage
    • By Grenage 24th Jan 18, 11:37 AM
    • 1,382 Posts
    • 1,303 Thanks
    Grenage
    • #3
    • 24th Jan 18, 11:37 AM
    • #3
    • 24th Jan 18, 11:37 AM
    I would use a bare plaster paint, or a cheap emulsion with 50% water - whichever is cheapest.

    Like Cycling, I'd also just use two coats.
    • Davesnave
    • By Davesnave 24th Jan 18, 12:19 PM
    • 24,238 Posts
    • 90,797 Thanks
    Davesnave
    • #4
    • 24th Jan 18, 12:19 PM
    • #4
    • 24th Jan 18, 12:19 PM
    1 coat bare plaster paint + two fine roller top coats here.

    No issues.
    'A society grows great when old men plant trees whose shade they'll never sit in.'
    • Nick_C
    • By Nick_C 24th Jan 18, 12:23 PM
    • 3,534 Posts
    • 4,828 Thanks
    Nick_C
    • #5
    • 24th Jan 18, 12:23 PM
    • #5
    • 24th Jan 18, 12:23 PM
    Two mist coats of 50/50 followed by a single top coat has worked well for me. That's for ceilings. I guess a wall might need two top coats
    • Aylesbury Duck
    • By Aylesbury Duck 24th Jan 18, 1:24 PM
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    Aylesbury Duck
    • #6
    • 24th Jan 18, 1:24 PM
    • #6
    • 24th Jan 18, 1:24 PM
    Agree with all the above. Had a lucky escape many years ago when a plasterer advised a much more naive me to use a PVA mix before painting. I did just that and then painted it and fortunately never had any problems but plenty of others have.
    • Ebe Scrooge
    • By Ebe Scrooge 24th Jan 18, 1:54 PM
    • 4,078 Posts
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    Ebe Scrooge
    • #7
    • 24th Jan 18, 1:54 PM
    • #7
    • 24th Jan 18, 1:54 PM
    I'm shortly going to be in the same position of painting on bare plaster, so thanks for the advice posted here and other similar threads.


    I realise the PVA option is not recommended. Purely out of interest - what's the reason it shouldn't be used, and where did the idea of using it come from in the first place ?
    I may not know much about art, but I know what I like.
    • Grenage
    • By Grenage 24th Jan 18, 5:30 PM
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    Grenage
    • #8
    • 24th Jan 18, 5:30 PM
    • #8
    • 24th Jan 18, 5:30 PM
    It's normally used before plaster skim, but you don't want it on the surface as paint may not stick very well.
    • Aylesbury Duck
    • By Aylesbury Duck 24th Jan 18, 6:03 PM
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    Aylesbury Duck
    • #9
    • 24th Jan 18, 6:03 PM
    • #9
    • 24th Jan 18, 6:03 PM
    It is often said that it provides an impermeable barrier onto which the paint will adhere rather than soaking into the plaster. That works both ways though. You will also seal in any moisture left in the drying plaster which would cause problems.
    • Ebe Scrooge
    • By Ebe Scrooge 24th Jan 18, 6:13 PM
    • 4,078 Posts
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    Ebe Scrooge
    Thanks both - that makes sense now you've explained it
    I may not know much about art, but I know what I like.
    • Ruski
    • By Ruski 24th Jan 18, 9:17 PM
    • 1,418 Posts
    • 827 Thanks
    Ruski
    If it is in a damp atmosphere if will reactivate the PVA and you will end up with 'crazed' paint - and it's an utter hctib to sort out

    HTH

    Russ
    Perfection takes time: don't expect miracles in a day
    • kevincharley
    • By kevincharley 10th Feb 18, 10:04 PM
    • 9 Posts
    • 1 Thanks
    kevincharley
    Could someone please tell me why the mist coat I've applied (80:20 in accordance with manufacturers instructions) is wiping off? Do I have to clean it all off and start again? Sorry to hijack someone elses thread but I've not had much luck on my own post.
    • Aylesbury Duck
    • By Aylesbury Duck 10th Feb 18, 10:08 PM
    • 1,450 Posts
    • 1,899 Thanks
    Aylesbury Duck
    Could someone please tell me why the mist coat I've applied (80:20 in accordance with manufacturers instructions) is wiping off? Do I have to clean it all off and start again? Sorry to hijack someone elses thread but I've not had much luck on my own post.
    Originally posted by kevincharley
    Where is it? In a cold environment? How long are you leaving it to dry?
    • kevincharley
    • By kevincharley 11th Feb 18, 10:15 AM
    • 9 Posts
    • 1 Thanks
    kevincharley
    Where is it? In a cold environment? How long are you leaving it to dry?
    Originally posted by Aylesbury Duck
    It's our hall, stairs, landing & bedroom, no, not particularly cold. It was a thin skim and left for several days so it was totally dry.
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