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Gloss for masonry window sills? is it more hard wearing

Looking for advice on whether oil based gloss is ok for external masonry cills. I've tended to have normal masonry paint but south facing and doesn't seem to last that long and also gloss is easier to clean and in a town centre location where building work etc means they get very dirty.

I know the environmental and health risk of oil based but if harder wearing and external thinking may be worth it.

All advice and recommendations appreciated

Comments

  • Lorian
    Lorian Posts: 6,906
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    Are they sound. And what are they already painted with?

    Painting from inside or outside?

  • TC77
    TC77 Posts: 2,841
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    Painting from outside , currently masonry paint probably dulux weathershield.

    I think I've decided normal.maspnry pai t either sandtex or weathershield ( dulux) as not normal to use gloss and while they get a lot of sun and rain - south facing at grou f floor i can repaint myself. Decorator doing all the windows which I cant do so doing these too.

  • FreeBear
    FreeBear Posts: 18,903
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    edited 9 July at 10:13PM

    Painting stone, especially if it is a soft one is not a good idea. Most modern paints, and that includes the likes of Sandtex, traps moisture and can cause the stone to spall. However, if you use a silicate based paint, it provides a "breathable" finish and is less likely to flake off. You'll need to strip off all the old paint before using a silicate based one.

    Limewash is another option, but it needs to be applied on a regular basis. So probably not a good choice if you are a slap it on and forget type person.

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  • TC77
    TC77 Posts: 2,841
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    Thank you so much

  • Lorian
    Lorian Posts: 6,906
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    Agree on silicate, but it's expensive. Mind you paint seems to have its own special inflation rate.

    You'll be wanting to make sure the existing surface is sound and not flaking first.

    If you have any cracks toupret murex rock solid is my favourite filler, sand within 24 hours, paint after 24 hours.

  • WIAWSNB
    WIAWSNB Posts: 3,808
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    TC77, what is happening with the existing paint? Is it just being gently eroded away so simply takes a fresh coat, or is it actually blistering, peeling, cracking, or what?

  • stuart45
    stuart45 Posts: 5,386
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    Do you know what type of.masonry cill it is e.g. Natural stone or reconstructed stone?

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