Back in May last year I painted my recently rendered walls with Dulux Weathershield smooth masonry paint. I thought it looked quite good at the time –
Unfortunately whatever it is B&Q used on the decking above the curved wall to give it its colour leaked out of it pretty rapidly when it rained. After a few months the curved wall had a lot of brown staining and looked horrible.
So I gave it another few months until I thought all of the deck colouring had leaked out of it and repainted the wall (using the same paint left over from last time). It looked good again for a day or so, but over time the paint bubbled and again looked awful.
So what’s going on? A reaction to whatever leaked out of the decking? Could the rendered wall be damp or something? I want to paint again, but I would like it to be the last time for a while!