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  • Re: Problem painting outdoor render

    From Andy Burns@21:1/5 to leenowell on Tue Apr 1 16:44:48 2025
    leenowell wrote:

    I have some old rendered walls which I would not

    now(?)

    like to paint the same
    colour as the house. About 6 months ago I painted them with some left
    over house paint. It seemed to take forever to dry and the following day
    it rained and the paint run off the wall.

    Is it a silicone render, such as K-Rend?

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  • From NY@21:1/5 to leenowell on Thu Apr 3 08:38:03 2025
    On 01/04/2025 17:27, leenowell wrote:
    Sorry, yes that should have read now 😀

    No it is regular sand a cement render. It was done at the same time
    using the same materials as the house. We just didn't get around to
    painting it for years.  The paint is a Dulux Trade exterior masonry
    paint . Was wondering if the render needs treating / cleaning with
    something or maybe watered down for first coat or something?


    I have a problem with Sandtex masonry paint flaking off after a few
    months. It dries perfectly well and doesn't wash off. but it does fall
    off in large flakes (maybe a few inches across). Some parts of the wall
    are affected worse than others. It's sand-and-cement render on brick,
    done about 30 years ago, long before we bought the house.

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  • From alan_m@21:1/5 to leenowell on Thu Apr 3 09:23:06 2025
    On 01/04/2025 16:27, leenowell wrote:
    Hi all

    I have some old rendered walls which I would not like to paint the same colour as the house. About 6 months ago I painted them with some left
    over house paint. It seemed to take forever to dry and the following day
    it rained and the paint run off the wall. Some patches dried but having
    now pressure washed them to have another go some of the paint came off. Anyone any ideas what is causing this and what the solution is?

    Many thanks in advance

    Lee.

    You say left over (masonary?) paint but how was it stored? Could it have frozen/frosted over a previous winter? How well was it stirred before use?

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  • From leenowell@21:1/5 to All on Mon Apr 7 15:48:11 2025
    It has been stored in the garage so not likely to have frozen. We have a
    fridge freezer and the boiler/ tanks in there too so if there was a
    freeze that heavy then it would have impacted at least the fridge
    freezer. Stirring issue could be the case as it is in a big container
    and some paint decanted into a smaller pot.

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