Breathable external paints

26 Apr 2011
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United Kingdom
Hi all,
I have a cob cottage. Looking to get the outside painted. Obviously crucial to use a breathable paint. What the most cost efficient breathable paint to use? Sandtex do a breathable paint. Is this appropriate?
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Dulux, Sandtex, etc claim that their acrylic paints are breathable- some people recommend using lime based paints though.

I have never worked on your type of property but if it is the kind of place that doesn't have a functioning damp proof course, then I would recommend that you look at the line based paints. I have seen the likes of Sandtex discolouring because of failed damp proof courses- which suggests that are less "breathable" than we are expected to believe.
Ive done a bit of Googling, and it seems ideally I need silicate paint. This requires 2 coats rather than 5+ coats that is required from a lime wash. So less labour costs. However, silicate paints look to be very expensive!

I think ideally the job needs one coat SecilTEK Silicate Primer AD25 followed by two coats of SecilTEK Silicate masonry paint. Does anyone know the cheapest place to buy this from? Perhaps I could get away with just the primer and 1 coat? (I knwo its cutting corners, but Im on a budget!)

Hi guys. Just reigniting this post:
My decorator has recommended Zinsser All Coat Exterior. Is this breathable and suitable for cob/lime plaster?
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