Why is my recently applied masonry paint peeling?

John Conlin / 25 May 2018

A reader would like to know why his masonry paint is peeling just 18 months after painting.



Question

The outside of our house is smooth rendered. It is in good condition with no cracks.

We repainted 18 months ago with good-quality masonry paint, but it has already started to flake. Why?

Answer

Did you pressure-wash the walls before repainting? If you are within three miles of the coast, the wall surfaces are likely to carry salt deposits that could be taken into solution by the water-based masonry paint. Similarly, in urban areas diesel deposits are an increasing problem. Or the paint may be incompatible with the previous type.

Send some paint flakes to the manufacturer, if possible also quoting the batch number.



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