Hello, we have a victorian building and the exposed exterior wall gets a serious beating from the elements. Decorated 5 years ago with a rubbishy Johnstones paint, now cracking, flaking, we are getting water ingress to the walls and need to repaint outside. I can find the shade, so I need a recommendation for a really good water-resistant and very durable paint to cover approx 10m x 5-6m area. Thanks.
Assuming the loose and flaking paint is removed, the cement based walls are clean, dry, sound and prepared as detailed in the technical data sheet you could consider Wethertex AP77 Flexible Smooth Masonry Paint.
This can be mixed to many RAL, NCS or BS colours in a matt finish.