I've just paid a small fortune to have the render (roughcast) painted on my house. The chimneys are a particular problem and needed scaffolding. While the scaffolding is still up I wondered if I could apply a coating to extend the life/look of the finish - in particular inhibit the re-growth of algae (it was treated and cleaned before painting). I've seen some hydrophobic coatings which I thought looked promising but wondered if their were drawbacks, e.g. preventing future painting, ineffective... or should I just accept it'll need doing again in 5 years or so and start saving now?!
Hydrophobic coating for freshly painted render
- Thread starter Clinokid
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- algae hydrophobic painting render
I have never used hydrophobic paints so I can't give you an authoritative answer.
The cynic in me questions the claims made by the manufacturers. I have seen, for example, a number of them claim that the paints even make your home warmer. They seem to be comparing unpainted render or brickwork with surfaces coated with their product. Whilst I am willing to accept their claims it seems obvious to me that any old masonry paint will prevent the render/bricks from soaking up water and therefore make the house warmer.
To date I haven't found any supplier willing to publish info regarding repainting. Frankly I can't see how you can repaint the stuff further down the line.
BTW, many makers recommend letting the render dry for a month before applying their paints.
The cynic in me questions the claims made by the manufacturers. I have seen, for example, a number of them claim that the paints even make your home warmer. They seem to be comparing unpainted render or brickwork with surfaces coated with their product. Whilst I am willing to accept their claims it seems obvious to me that any old masonry paint will prevent the render/bricks from soaking up water and therefore make the house warmer.
To date I haven't found any supplier willing to publish info regarding repainting. Frankly I can't see how you can repaint the stuff further down the line.
BTW, many makers recommend letting the render dry for a month before applying their paints.