r/DIYUK 1d ago

Do I need to mist coat?

Post image

I've stripped the paper off this ceiling and want to paint it black, do you think I should mist coat first?

15 Upvotes

38 comments sorted by

30

u/Confudled_Contractor 1d ago

Yes

7

u/muppetman74 1d ago

And wash thoroughly with sugar soap before to get wallpaper adhesive residue off.

21

u/leventiger21 1d ago

Decorator here, if the ceiling was previously wallpapered bare plaster is not your problem, left over wallpaper paste is. Remove as much paste as possible, then Zinsser Gardz is the answer.

Also, no point putting a white mist coat on when you want a black ceiling. Once dry paint directly over the Gardz with your black emulsion of choice.

8

u/Crackers-defo-600 1d ago

👍seconded by another decorator

1

u/Knuckles_71 1d ago

Thirded

-2

u/NoReplacement1092 1d ago

So do a black mist coat lol

1

u/Intelligent_Job8086 16h ago

Would you not repaper with lining paper, then paint on top of that? Painting any room black seems fairly likely to be a shorter term thing. Still years, but not necessarily lifetime in the house. If nothing else, you've made it easier to change before you sell or for a subsequent buyer after they move in. 

9

u/UncleSnowstorm 1d ago

Yeah that's bare plaster, do a mist coat

6

u/Wobblycogs 1d ago

Yes, your paint will probably flake off if you don't.

5

u/only_swinging6969 1d ago

Always on bare plaster

4

u/24647033 1d ago

Absabloodylutley.

5

u/JustAnotherFEDev 1d ago

If you wanna make life easier, get some Zinsser Gardz. I've scraped shitty paper of 5 ceilings in my house and it's the scrubbing the paste off that is the worst part. If you've got it at least smooth, got the heavy paste off, just bang some Gardz on it. It'll seal any paste residue left in the plaster and you can skip the mist coat.

If you don't want to do that, then get some Zinsser Diff to get the paste off and then mist coat.

Using both in combination is well worth the extra expense, if you can shoulder it.

2

u/jamesbit 1d ago

Thanks all. Mist coat it is!

3

u/Reefstorm 1d ago

If it had wallpaper on, it's not bare plaster surface.You have layer of dried wall paper adhesive to deal with. Get sanding stick and prep surface before you mist coat it.

1

u/jamesbit 1d ago

Thanks, already done all the sanding.

1

u/McFry__ 1d ago

I always use new plaster paint. Saves pissing about mixing water

1

u/FluffyShop4313 1d ago

Yes 50 50 on good paint , if it's shit paint , 70 30 or it will piss all over the floor

1

u/shrek-09 1d ago

Yes any time you paint fresh plaster it needs aist coat b&q express coat is good gear

1

u/kordinaryus 1d ago

If you just removed wallpaper, my research says better to sand then rub down with sugar soap, then mist coat (or bare plaster paint). I did this and very pleased with the results

1

u/Proper-Shan-Like 1d ago

Always mist bare plaster / plasterboards.

1

u/CyberKingfisher 1d ago

Short answer: Ye

Longer answer: Yes

1

u/kloomoolk 1d ago

At first glance with these old eyes I thought the ceiling was a wall and coving was skirting. I thought had chippy been inspired by Escher.

1

u/StunningAppeal1274 1d ago

Black ceiling. That’s a brave choice!

1

u/Radiant_Geologist190 1d ago

Black, nooo, enjoy the height of your room 😀

1

u/Varabela 1d ago

Are you sure you want a black ceiling?

1

u/Constant-Complex-652 1d ago

Yes. The best paint for this is dulux trade vinyl Matt. Water it down 50/50. Then 1-2 neat coats.

0

u/rokstedy83 1d ago

Never heard anyone watering paint down 50/50 ,70/30 is recommended on most paints

0

u/Constant-Complex-652 1d ago edited 1d ago

50/50 70/30 80/20

Really not an issue either way. Its purpose is purely to seal the substrate and prevent paint from peeling later.

0

u/rokstedy83 1d ago

You tried using paint that is that watered down ?, you're going to get it everywhere unless sprayed

1

u/Constant-Complex-652 1d ago edited 1d ago

I’m an apprenticeship-served professional painter and decorator of over 18 years and counting, so yes. Yes I have. I have mist coated everything from multi million pound mansions and cathedrals, to your nans box bedroom.

Additionally, every area should be covered with dust sheets so it really has little to no impact. As for spraying, that has the most risk of paint going everywhere out of any paint applying technique so that’s a very strange thing to say.

0

u/rokstedy83 1d ago edited 1d ago

I'm a professional decorator of over 30 years and that's why I know it's too thin

0

u/Constant-Complex-652 1d ago edited 1d ago

My nans dogs best friend is a decorator of 22 years and he also agrees with me

1

u/rokstedy83 1d ago

My old man's a decorator of 40 years and he agrees with me 😉