Re-painting an acrylic-painted exterior stone wall

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Hi, the north wall of our house is made of stone that has not been rendered. In the past it has been painted externally with acrylic masonry paint. The masonry paint is old but not flaking, and there is a thin layer of green mould over much of the wall. On the inside, the wall is cold and we have a problem with condensation and mould forming on the surface both downstairs and upstairs. Is there any point in using Beeck mineral paint over old acrylic paint? Isn’t the old acrylic paint just going to go on trapping moisture in the wall? I’m guessing it would be very costly to remove the old acrylic paint before re-painting, so that’s not really an option for me. I’d be grateful for your advice.

Edited answer
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Hi Vicky, thanks for your question. Paint is only as good as the surface it is applied to. If existing coatings are present, and these aren’t removed, moisture will still be held behind this coating. Paint removal may not be as expensive as you think, if you have the time to undertake the work yourself. Here’s a link to our article on paint stripping: https://cornishlime.co.uk/application-guides/paint-stripping/ and you can find the appropriate products here on our website: https://cornishlime.co.uk/products/associated-products/scheidel-asur/ and https://cornishlime.co.uk/products/associated-products/scheidel-sg94/ Please don’t hesitate to get back to us if you need any further information or advice.

Edited answer
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