I had purchased this house from a builder a number of years ago. On both sides of the the exterior of the house where the side concrete walls meet the ground, there is a black coating that was pasted on the concrete surfaces. I believe that the black coating was pasted to keep the water away from running into the basement.
How do I whiten the black coating to make it more presentable? The un-pasted portion of the concrete side wall is light greyish which is fine, but I do not like the black coloured portions.
Please look at the pictures.
There is a couple of things you can try. First you need to find out if it is a water or oil based coating. If you rub diesel fuel on it and it comes off its oil based, if not then it's water base. If water based,, a grinder with a wire wheel will take most of it off. Either way you will need to repaint to make it nice looking. You can never get it all off unless you grind off some of the concrete. Also you could parge the area but again it will look patchy
To make it very easy for me, could I sandpaper the surface? Then paint it with a light grey paint to match with the colour of natural concrete?
Do I use exterior paint for concrete?
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