Peeling Paint on New Plaster despite sealing with 4:1 mix

Postby PLeBallois » Tue Jan 01, 2008 11:25 pm

following the advice on this site, we have prepared the newly plastered walls of our loft conversion using a 4 parts paint to 1 part water mix to seal the plaster before top coat.
However, tonight, one area of the wall started peeling and lots of paint has come off.

We used a B&Q basic white silk paint (left overs from friends) and applied it with brush and rollers.

The heating has been on in the room with the doors and windows closed.

The paint is only peeling in one area (so far) - all walls are plasterboard bar one. The one that is peeling is plaster board and is the 'face' to the remaining loft cavity and therefore has cold air on the other side, although there is a 10cm thick insulation board behind AND is has only peeled on one half of the wall.....

so, HELP, why has this happened? and what so we need to do now to ensure that te top coat will be OK? we really do not fancy having to peel it off everywhere.....
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Simply Build It

Postby ndp decoratoring services » Thu Jan 03, 2008 2:24 pm

you should have used MATT not SILK and it should be 50/50 mix. matt sinks into wall silk sits on top so to speak.
also you shouldn't have had heating on unless freezing then only a bit.
the rest of the walls will eventually peel'crack unless you fully remove the silk no matter what you put on as finishing coat.
your only other option is to wait untill plaster fully dry (usually 6 months of being done) then put up a lining paper.
whoever said you can use silk is completly wrong.
hope you get sorted nigel
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Postby rosebery » Thu Jan 10, 2008 11:55 pm

and preferably Contract Matt or Supermatt for your mistcoat IMHO.
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Postby PLeBallois » Sat Jan 12, 2008 1:09 pm

thanks for the help. we are trying to get the silk off - proving very difficult even when we use the water based stripper recommended on diy doctor. have tried light sanding, nitromors, light steaming and all sorts....
any tips would be greatly appreciated....?

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