1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Mist coat has left a chalky finish, final cost flaking/lifting

Discussion in 'Decorating and Painting' started by John2016, 16 Feb 2021.

  1. John2016

    John2016

    Joined:
    18 Jun 2016
    Messages:
    72
    Thanks Received:
    2
    Country:
    United Kingdom
    Hello,

    We recently had our kitchen skimmed, when it was completely dry (2 weeks) I decided to apply two coats of mist (50/50) coat leaving 3-4 hours in between each coat.

    The paint I used was: https://www.wickes.co.uk/Wickes-Matt-Emulsion---White-10L/p/145119
    Honestly, I didn't read the reviews before purchasing, I was passing wickes and thought I'd pop in.

    I picked up some Dulux Easycare Kitchen tester pots and when trying them out the paint started to flake.

    I've applied mist coats before and never had any problems, however, this time round when I run my hand over the dried mist coat paint, its like chalk.

    Whats the most practical advice on having this resolved? I don't really want to wash/sand down all the walls and ceiling. Could I just get a contact Matt and paint over the mist coat with two coats and then apply the finish Easycare.

    Thank you.
     
  2. Sponsored Links
  3. sparkwright

    sparkwright

    Joined:
    20 Aug 2009
    Messages:
    8,144
    Thanks Received:
    1,010
    Location:
    Dorset
    Country:
    United Kingdom
    Despite claiming to have high opacity (it doesn't according to reviews) I think this retail paint is too thin to be diluted as much as 50.50.

    Out of interest, does the paint wipe off the wall nicely with a damp cloth?

    I only ask as it may be problematic to try to paint over this.
     
  4. John2016

    John2016

    Joined:
    18 Jun 2016
    Messages:
    72
    Thanks Received:
    2
    Country:
    United Kingdom
    Yep with a damp cloth and after a few going over it does wipe of to bare plaster. At the back of the paint it does say to add up tp 40% water for new plastered walls, however, mime were skimmed, if that makes a difference.
     
  5. sparkwright

    sparkwright

    Joined:
    20 Aug 2009
    Messages:
    8,144
    Thanks Received:
    1,010
    Location:
    Dorset
    Country:
    United Kingdom
    Newly plastered = newly skimmed, as far as painting should go.
     
  6. John2016

    John2016

    Joined:
    18 Jun 2016
    Messages:
    72
    Thanks Received:
    2
    Country:
    United Kingdom
    Understood.

    How would I go by resolving the problem?
     
  7. opps

    opps

    Joined:
    16 Jun 2006
    Messages:
    4,580
    Thanks Received:
    718
    Location:
    London
    Country:
    United Kingdom
    40% water sounds like a lot for a very, very thin paint.

    I would phone wickes and complain.

    You could buy some Dulux trade matt emulsion and thin it- one part water to 5 parts paint (17%)- and see if that works as a mist coat. If not wash the wickes paint off (messy) or use an appropriate Zinsser primer (expensive).
     
  8. Quilts76

    Quilts76

    Joined:
    19 Feb 2021
    Messages:
    24
    Thanks Received:
    2
    Country:
    United Kingdom
    We had this on a job and was told the plaster was at fault and possibly out of date.

    Zinsser primer as above maybe the only option.
     
    • Like Like x 1
  9. Sponsored Links
  10. opps

    opps

    Joined:
    16 Jun 2006
    Messages:
    4,580
    Thanks Received:
    718
    Location:
    London
    Country:
    United Kingdom
    Good call.

    Now I think about it, I have noticed something similar where I am currently redecorating. A small section of recently plastered and painted (by the builders a few months ago) is chalky. I had assumed that it might be salts in the plaster but haven't gotten around to addressing it yet.
     
  11. John2016

    John2016

    Joined:
    18 Jun 2016
    Messages:
    72
    Thanks Received:
    2
    Country:
    United Kingdom
    Thanks, I assume this is something which would go over the mist coat? Removing the mist coat in the ceiling is going to be a pain.
     
  12. lowster

    lowster

    Joined:
    13 Apr 2011
    Messages:
    80
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    Did you ever find solution to this? I have the same problem, the mist coat 25% water to 75% crown trade emulsion has left a chalky flakey finish.
    I'm in the process of washing it all back off with a sponge and water. Don't know what the next move is?
    The surface is still quite dusty, do I use an acrylic primer like Mapei primer G and then paint on to that? Anyone in the know have any idea please?
     
  13. John2016

    John2016

    Joined:
    18 Jun 2016
    Messages:
    72
    Thanks Received:
    2
    Country:
    United Kingdom
    Lowster, what does it say on the tin for fresh plaster?
     
  14. lowster

    lowster

    Joined:
    13 Apr 2011
    Messages:
    80
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    Hi, The Crown tin says up to 40% water for a mist coat - I kept it well within the recommendation but it just doesn't look right. (Is that how a mist coat should be?) I wouldn't trust painting over it, if I run my hand up and down the wall, there's a chalky pile of paint dust on the floor...
     
  15. Wayners

    Wayners

    Joined:
    24 Oct 2020
    Messages:
    264
    Thanks Received:
    73
    Country:
    United Kingdom
    Prime plaster or anything chalky.

    Acrylic primer undercoat is good and if I have to use dulux easy care then I get it tinted to match as a primer.

    Gardz is good but clear.
    Beeline sealer is cheaper and also good but follow the guide on thin or its like glass. It's good value.
     
Loading...

Share This Page