Unusual pattern when plaster drying - causes issues when mist coating

Discussion in 'Plastering and Rendering' started by Jacklev94, 14 Aug 2021.

  1. Jacklev94

    Jacklev94

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    Hi,

    We recently had our 1930s house replastered throughout and noticed some patches appearing through the mist coat. It’s been 5 weeks since the plastering was complete and appears to be totally dry.
    When painting the issues seem to be where the plaster has some patterning as the attached pictures will show. There are areas where it’s completely fine and the mist coat covers without issue but there’s also a lot of patches on the plaster as per the pictures.
    Any advice would be much appreciated!
    Thanks
     

    Attached Files:

  2. JohnD

    JohnD

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    it's often PVA adhesive on the surface, but yours looks to me more like watery slurry where the plaster was polished.

    do you have any unpainted plaster, that you could experimentally rub with a coarse, damp old towel or other rough cloth?
     
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  4. Alastairreid

    Alastairreid

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    Its called tiger stripes.

    If you one coat or trowel up too early, use too much water when trowelling up.Or apply too much pressure when flattening can also cause them.
     
    Last edited: 14 Aug 2021
  5. albaPhenom

    albaPhenom

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    Any plastering I’ve had done looks similar, painted up fine after a mist coat.
     
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