[tonto]

I have a job to re-paint over a concrete block retaining wall about five feet tall holding back a large hill behind it. Each time I do, a white powdery-like deposit bleeds through in spots just several days after painting. It appears to be an alkaline deposit. Is there any surface coating I could apply to stop the white deposits from bleeding through. Sealing the inside of the block wall surface is not feasible.
Ron Matson
[email protected]

 

[plainpainter]

That is efflorescense - and it appears there is a pressure forcing it through - you have to remove it with an acid. But other than that I don't what else you can do - it will keep coming through as long as there is a positive pressure. There are some things in life that can't be painted.

 

[slickshift]

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