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Housing - Renovation: Lime plaster breathable wall Macpherson Eclipse Emulsion

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  1.  
    • CommentAuthormzthomps
    • CommentTimeAug 20th 2023
     
    I have just renovated internal walls with breathable insulation - diathonite| wood fibre| diathonite| lime. Is Macpherson Eclipse Emulsion suitable as a mist coat? It claims high permeability, but I can't track down the SD value or any reference to lime. Does anyone know any better? Many thanks. This is the link to data sheet: https://www.paint-direct.co.uk/content/documents/products/132700235123271550-macpherson-eclipse-emulsion-technical-data-sheet.pdf
  2.  
    Posted By: mzthompsI have just renovated internal walls with breathable insulation

    Do you mean you have insulated your internal walls or have you put internal insulation on your external walls (IWI) ?
    •  
      CommentAuthordjh
    • CommentTimeAug 20th 2023
     
    Assuming you mean you put internal insulation on your external walls (as otherwise it doesn't matter too much once the lime is fully dry), the accurate answer is I don't know! :cry:

    But, taking a SWAG, it seems to have a similar list of ingredients to Dulux Supertrade Matt so probably is permeable. We used the Dulux because they did use to publish an SD value, but I can't find one now. So it's always possible they've changed the formulation. But both paints are advertised for use over newly-applied plaster so it would be very surprising if they weren't fit for use. We used a clay paint for the top coat, FWIW.
    • CommentAuthormzthomps
    • CommentTimeAug 20th 2023
     
    Thanks. Yes - the inside of the two external walls (mid-terrace).
    • CommentAuthortony
    • CommentTimeAug 20th 2023
     
    I think that the lime will react with the paint, trying to paint stripper it causing some problems. Lime is highly alkaline.
    •  
      CommentAuthordjh
    • CommentTimeAug 21st 2023
     
    Posted By: tonyI think that the lime will react with the paint, trying to paint stripper it causing some problems. Lime is highly alkaline.
    I doubt it, TBH, but if there is any doubt then try a small inconspicuous area first. Or of course use limewash instead.
    • CommentAuthormzthomps
    • CommentTimeAug 22nd 2023
     
    Crown have now confirmed that Eclipse is not suitable to be used on lime. Requires a mineral based coating.
    • CommentAuthorkristeva
    • CommentTimeAug 27th 2023
     
    <blockquote><cite>Posted By: mzthomps</cite>I have just renovated internal walls with breathable insulation - diathonite| wood fibre| diathonite| lime. Is Macpherson Eclipse Emulsion suitable as a mist coat? It claims high permeability, but I can't track down the SD value or any reference to lime. Does anyone know any better? Many thanks. This is the link to data sheet: https://www.paint-direct.co.uk/content/documents/products/132700235123271550-macpherson-eclipse-emulsion-technical-data-sheet.pdf</blockquote>

    The problem with using emulsion on lime is acidity. Farrow & Ball Estate emulsion has an SD value similar to lime wash but there technical department once told me the pH value of the lime plaster should not exceed '10' otherwise the paint would likely peel off. NHL plaster usually dries to a ph level of between 8 - 9, I would imagine lime putty based plaster to be higher.
  9.  
    Over here there are a number of brands of lime based paint for walls that are advertised as breathable and about the same price as ordinary paint.
    A quick search for the UK gave
    https://organicnaturalpaint.co.uk/natural-paint/lime-paint/
    and
    https://www.celticsustainables.co.uk/paint-for-lime-plaster-internal/
    although both stocked Auro paint among others so probably worth a better search for lime based paint which should be compatible with the lime on the walls. Ask the manufacture.

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