Concrete wall paint..

Old 04-04-09, 09:40 AM
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Concrete wall paint..

I need to paint a concrete retaining wall that is by the sea, can anyone give me suggestions as far as paint type. All comments appreciated.
Old 04-04-09, 10:08 AM
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What is behind the wall? has the back side been sealed and a means of removing any moisture been installed? If moisture passes thru the wall it can affect your paints bond to the wall.

Block walls and some poured concrete walls need a 'block fill' primer which will fill minor voids and seal the wall. There are other masonary primers for slick concrete or stucco. The finish coat should be a quality latex house paint. Most masonary paints are cheaper in both price and quality.
Old 04-04-09, 10:59 AM
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Because of the conditions behind the wall, retaining walls are very difficult to do a good job.

The best way is to use a traditional concrete and repair method, but it is not cheap.

Apply 1 or even 2 coats of Thoroseal over the wall. Depending on the texture, you can adjust the texture by varying the water. After that you apply Thorosheen as a final coat. You will end up with a breathing acrylic coating coating with a long durability. There a few standard colors, but it can be tinted. It is usually not available in paint stores since it is used on commercial and industrial applications in addition to concrete restoration.

You must not "seal" the concrete wall or the coating will either peel or pull off a concrete layer if you have freezing. Just sealing the back of the wall is not good enough for a professional job.

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