Help! Painted new plaster, have a crack!

ITtim

Furts wrote: »

Paint for new plaster, obliterating emulsion, high opacity...whatever one calls it the paint contains a high percentage of filler - probably chalk, or China Clay, but I am not a chemist. The product is meant to fill dimples, air holes, imperfections, shrinkage cracks - it is formulated for this purpose as well as to allow the plaster to dry out through it.

So I would put another coat on the ceiling, assuming of course that your plasterer has not cut corners and caused the problem. It may be valid to ask were there area of damage, or board joints, requiring scrim to be applied before scimming the ceiling? If so, did the plasterer do this?

Thanks Furts, it was an artexed ceiling, i know he said he had to do two coats of plaster, i've no idea about the scrim tape, there we're cracks on the ceiling before but not one that ran the length that this one does, not that i know of anyhow.

should I wait longer to do the second coat or should I be ok to do it now?

Furts

ITtim wrote: »

Thanks Furts, it was an artexed ceiling, i know he said he had to do two coats of plaster, i've no idea about the scrim tape, there we're cracks on the ceiling before but not one that ran the length that this one does, not that i know of anyhow.

should I wait longer to do the second coat or should I be ok to do it now?

It should be OK to re-coat after a few hours, or certainly by the following day, if it were a typical construction site job with heating in the room. So yes, get on with the painting.

But do bear in mind that there were cracks before so you can expect cracks now unless the cracks were scrimmed. You may be lucky, the ceiling may be rigid, there may be no flexing and they may not re-appear.
(There is now no way of knowing about the scrim because the workmanship is hidden. You could ask the plasterer, and sense if you are getting an honest answer from him.)

ITtim

Just one quick question to add, i've got some bulls eye 123 primer/sealant that i'm going to use on some coving joins, could I apply this to the cracked area and then paint over with normal paint when dry? i'm wondering if its suitable for cracks?

elver_man

Zinsser Bullseye 123 is excellent stuff if you use it for what its intended.


If i'm reading your post correctly then I understand you will paint over the crack to help fill it? Its not meant to be used as a filler but as a primer, sealer or stain blocker.


I'd also be careful using it in a limited area as when you come to over paint you will probably be able to notice the area that has had the Zinsser applied as it may well give a slightly different finish to the rest of the ceiling.

fixhome

I have an old house with lath and plaster walls. When I moved in a year ago I fixed dozens of cracks in the plaster with spackling, but many of them have opened back up again. What is the best way to solve this with a more permanent solution?

fixhome

Rightly said elver. It is definitely not meant to be used as a filler but a stain blocker.

fixhome

Why is not good to use PVA?

ceredigion

fixhome wrote: »

Why is not good to use PVA?

Polyvinyl acetate
The point of a mist coat is that it does not have any vinyl in it.
the vinyl does not get absorbed in to the plaster and can peal of the surface.

Davesnave

I used the Wickes equivalent of the Screwfix new plaster paint a few weeks ago and had no problems with it. It gave me excellent coverage and the plaster dried-out fully.

fixhome

thank you credegion for the informative reply. People have been recommending me to use PVA..i dont know why!