Plastering Question

Cracks occurred after internal wall / re skim over sand and cement

Hi there, I re skimmed an internal wall which had a sand and cement base, on the first attempt the plaster dried out really quickly. I applied 5-6 coats of PVA bond to take out the suction but it still dried out. I then found numerous cracks starting to appear throughout the wall, I then used PVA all over the wall and left to soak into the wall, I then re skimmed the wall with multi finish. All was fine but there are some slight cracks appearing again. What can I do to get rid of the cracks?

1 Answer

Best Answer

Hi, if you had to apply pva 5 or 6 times your pva was too weak. I use unibond pva, it contains more polymer which is the glue. You should always do a test for suction first, then apply a sealer coat of pva if it needs, followed by a neat coat and apply your skimming when it's tacky for reskim work. Sometimes it pays to put the sealer coat on the day before. When you talk about cracking do you mean crazing? This is the term for drying out too soon. Cracking is normally movement which is solved by expanding metal or scrim depending on the size. This is only a guide as different backgrounds vary.

Answered 26th Sep 2013

MOM Plastering Limited

Member since 26 Sep 2013

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