Bathroom ceiling flaking

[ukmercenary]

Hello

So my bathroom is fairly newly replastered I remember I just painted it with a standard matt emulsion onto the plaster.

Obviously, that was my first mistake.
I have started to strip back the flaking paint.. it seems worse over by the Window. The rest of it seems to be sticking ok.

https://photos.app.goo.gl/a2EXZRRYBHsZVBA28

After reading on here:
https://www.diynot.com/diy/threads/mist-coat-or-pva-bare-surface-basics.425261/

I decided to get some: https://www.toolstation.com/leyland-trade-contract-matt-emulsion-paint-10l/p94243 to use as a replacement for mist coat.





I then plan to paint over the top with a B&Q bathroom paint for use it steamy places.

My question is as that paint on the ceiling is mostly sticking should I leave it their?
and the go over the top with these two paints?

Cheers
Paul

 

[opps]

If the rest of the paint is sound then just paint over it.

One potential problem that you may have is that as you didn't thin the first coat, the new paint might end up pulling the old paint off as you roll it. The water in the new paint may activate the old paint.

I would be inclined to apply a coat of zinsser BIN over it- it is alcohol based rather than water based and hence won't "soften" the old paint. It is however rather pricey.

I have no idea which B&Q paint you are planning to use (I wouldn't touch their own brand paint with a barge pole- just my preference though). Assuming that it is a waterbased eggshell it should be ok. Just remember to roll the first coat slowly and lightly. Once the first coat has dried, the water in the second coat should not penetrate through the first coat of eggshell, so just roll it normally.

If you have some of the original emulsion left, just thin that as the first mist coat on the bare areas rather than buying new tin of contract emulsion. Then apply a full fat coat (or two) over the mist coated parts.

 

[opps]

I decided to get some: https://www.toolstation.com/leyland-trade-contract-matt-emulsion-paint-10l/p94243 to use as a replacement for mist coat.

BTW- contract emulsion is an inferior product, it has a lower acrylic/latex content and should only be used when the new plaster is still likely to be releasing moisture or as a base coat. The low latex content allows moisture to escape but it makes it difficult to wipe away dirty marks. You will still need to thin it by about 10%.