Thread: New Plaster.....Disaster

Hello... I am seeking help... We have just added two new rooms to our home. The plastering was finishished last week, I took the advise of the plasterer and (unfortunately) I painted it one week later. Yes I know its far too early as I have checked other resources. (You can choose your friends but not Family!!!) What I want to know now is what I should do... I painted it with an oil based sealer binder, when I sand patches I skimed the paint is peeling and the plaster seems to be chalky.

Should I wait Weeks....Months then paint it with a seeler binder again???

Thanking you in advance

C

id get the nice plasterer back and tell him to fix it
on most new houses the set will not be touched untill atleast 6 to 12 weeks now its been sealed i guess your holding the moisture in if they are cavity walls should dry in 4 to 8 weeks intenal walls no cavity may take double that but we are having nice weather so open up all the windows and let it breathe has it gone drummy?

Hard plaster certainly takes more time to dry. I would be a bit concerned about the plaster being chalky. That should not happen.

No it has not gone drummy! Yet!

Do you think I should just wait and seal it again?

Seal it in a couple of months i mean!

it may also be chalky from too little lime putty? this will make a weak chalky set but make it easyer to apply was it windy when he applied the set ?
this will make it dry too fast but you will have some drummyness from this ?
is this guy very experianced? not every plasterer can set it is a skill of mixing and applying
i wouldnt seal it for atleast 7 weeks but if its chalky then i wouldnt wast the sealer on it
i would tell him there may be a problem so its not a shock in 6 weeks that he has to remove the set and re do

He is experienced, the chalkyness is only in the couple of spots where the paint lifted, it is fine down the bottom of the wall where it has not been painted. I thought that traping the moister may cause the chalkyness...like a wall that is behind a shower that is not sealed.

Did the plasterer tell you you can plaster within one week?
Was it two coat float and set? And when was the float (cement) done?
Depending on the weather and ventilation determins how fast your render and set will take to dry. Give the walls plenty on ventilation and even put a fan on the walls.
A fan or heater and have the windows open.I think a fan will do.
If you painted before three months then the plasterer is not responsible. Rule of thumb do not paint 6 months in winter 3 months in summer. This is what we were tought in school although most building sites will paint on plastering after three months or less.
Another option is to get a damp meter to test the moisture in the plaster as you need to know the float under the set may still be drying. If you painted an oil based sealer then indeed you have trapped the moisture so yes your best bet is to wait longer than shorter dont touch it for at least a few months then have another look at it.
If the plaster is chalky then that seems to mean it is dry but the undercoat may still be wet. I think the mositure from the first coat is coming out and that is why you are getting peeling. You may find you are getting blistering or maybe you sanded too soon this is also a reason why you may get peeling.

Unfortunalty a lot of plasterers do not put the right ratio of materials in their work increasing production. A 50 percent lime to plaster ration is a good mix 60/40 is okay any weaker means too much lime and a softer finish meaning taking longer to cure (dry)
If you put the right material in the float coat then tht means you can get a good hard finish in the set.