Exterior masonry paint flaking

17 Nov 2020
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United Kingdom
Hi all,

Not sure if I'm in the right place but I'm in need of some help.

I painted an external wall around 18 months ago. The wall is breeze block and rendered with sand/cement. The wall was painted with a thinned down white masonry paint as an undercoat and then it had 2 coats of vaspor masonry paint. This was done in the summer but by the winter the wall started to flake. Upon inspection all 3 coats seems to have flaked off. To be honest I'm at a loss to what I've done wrong. However the wall does seem rub away quite easily so I'm wondering if the render had too much sand in the mix. Anyway, I'm after some advice guys. I was think of rubbing the wall down and putting a specific primer on before any masonry paint. What does everyone think?

Many thanks in advance

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