Hairline Cracks on Wall After using PVA before Plastering and Painting


Postby smuglilal » Sat Jan 12, 2008 12:59 pm

recently plastered an old victorian house looked great but after a few months of painting i now have hairline cracks in it can anyone tell me why this occured
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Postby rosebery » Sun Jan 13, 2008 3:03 pm

How did you prepare it before painting?

What precisely did you paint it with?
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Postby smuglilal » Tue Jan 15, 2008 8:39 am

i put pva on a couple of times before plastering left it till it went dusty pink and painted in matt emulsion i did use board finish instead of multi could that be the problem
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Postby rosebery » Wed Jan 16, 2008 12:10 am

PVA before plastering OK. PVA before painting NOT OK - but that's just bye-the-bye

Did you do your first coat as a "mist" coat ie well thinned (anything up to 50%) with water? If you put paint on the plaster neat the plaster sucks all the water out of the paint which subsequently cracks because it hasn't keyed in to the plaster. You should still be able to see the plaster through the first coat which is why it's called a mist coat.

2nd coat should be thinned by 10 - 25% and the final coat neat.

Which matt did you use? Supermatt is best for very new (ie barely dry)plaster. Hope it wasn't kitchen or bathroom paint - both are carp.

Cheers
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Postby smuglilal » Thu Jan 17, 2008 6:58 pm

so how do i get rid of these cracks every time i paint they seem to reapear not sure now wether they are in plaster work or paint job
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