A remedy for stains on render Brickwork, drystone walling, render are a few subjects covered here. Click here to post questions and get answers

[saki]

We had a fairly ugly breeze block retaining wall in our garden. We got it rendered with KRend several years ago but it is now discoloured with black streakes. These are caused by rainwater running down the coping stones especially in the cement joints between the copers. We have tried cleaning the render and although partly successful there are still visible stains. We got a company in but they said it would be impossible to clean the render completely and anyway the problem would recur fairly quickly. They also said there was no way to prevent the stains from occuring by repointing the joints between the copers.
So I am looking for ideas to cover the render or obscure the stains in some way. I did think about applying a smooth external masonary paint which I hope we could simply wash in the future or repaint every couple of years. Would that work? Or can someone suggest another remedy?

[decorgeek]

Before you reach for the paint roller, consider a breathable, silicone-based masonry cream instead. The big plus here is that it gives you that fresh, new wall look without the risk of trapping moisture behind the surface, which is exactly what you want to avoid with K Rend. It also makes the whole wall much easier to wipe down if marks do appear later on.

[saki]

Before you reach for the paint roller, consider a breathable, silicone-based masonry cream instead.

Thanks for your reply. Would this cover the marks or would I have to remove the marks before applying?