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Painting & Wallpapering/Honeycomb cracks in paint on new plaster

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Question
Hi,
Basically had thro lounge and walk in kitchen replastered. Primed half with plaster primer and was told to leave other half by painter who would mist coat it.
First coat on everywhere great no probs, second proper coat of matt white ok no probs, third coat, no probs where mist coat applied on new plaster but where primer applied honeycomb cracks have appeared everywhere.
Did painter apply last coat too early because he put two coats on in same day?
How do I fix this problem please

Regards

Eddie

Answer
Eddie,

You don't specify what type of plaster primer was used, I am going to presume it was oil or pva based, as this would explain the effect you are observing.  

A mist coat which is contract emulsion thinned by 50% water, followed by two coats of a contract emulsion perhaps thinned by 10% water is the correct way to treat new plaster. I don't think two coats of emulsion in one day is not the problem.

If you have sealed the new plaster and are not allowing moisture vapour permiability then unfortunately there is no magical surface finish that can cure the problem.  It is possible to coat with a high build coating, but that doesn't cure the underlying problem of efflorescence which has to come to the  surface.

The only recommendation is to remove the coatings back to the plaster and then proceed with 1 mist and 2 coats.


Hope this helps.


Regards,


Tony.  

Painting & Wallpapering

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Tony Gallagher

Expertise

I can answer questions on all interior and exterior painted surfaces. Ranging from new plaster and woodwork to galvanised metal, rusty metal to exterior render stucco, All external timbers from solid oak to tannalised fencing. I have specialist knowledge on Flame Retardent products for Combustiable and Non Combustiable surfaces. Although some product knowledge of Car finishing I do not feel I have enough experience in that field to be able to offer knowledgable solutions.Colour queries are welcome but I have not got a design background and can only answer semi technical questions with regard to colour.

Experience

Fourty years selling decorative products on behalf of major manufacturers such as Permoglaze,Crown,Macphersons,Johnstones, Leyland,Sikkens & Sadolin. More recently in a merchant capacity I have been involved with Dulux, Farrow & Ball and Fired Earth products. I have recently commenced training in enviromentally friendly product ranges, such as vegatable oil paints and varnish.

Organizations
PDA (Assoiciate Member)

Education/Credentials
H N C Business Management. Several In House achievement certificates for product training.

Past/Present Clients
Ford Motor Company. Nissan, MOD, Home Office, The University of Sheffield, Local Goverment.

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