I don't have a drastic water problem, but over time the walls grow "white
fuzz"...and it tends to be in the corners.
In reading your email I was thinking a possible solution would be to wire
brush the areas of concern down to the exposed block then apply the
Hydro-Seal. Or remove the paint some other way?
Basement Sealerman Answer
I want to emphasize that Hydro-Seal 75 will stick to the latex but is by no means going waterproof like it does when applied to bare concrete or block walls.
Regardless of what you have on the walls you need to address those areas where the powdering is a concern should be brought down to bare block, wire brushed and cleaned as best you can. While you don't have a water seepage issue, it is the water vapor drive bringing the powders to
the surface of the block, and the Hydro-Seal 75 can control and prevent
that.
It is very important in these applications that you wash surface with TSP and then
rinse with clear water for your preparation. Then wire brush any areas of
concern. I use a wire brush I can attach to a pole. Great tool and it saves
the knuckles.
Again, in areas where paint seems sound and can't be removed you run the chance of a problem re-occurring, popping up in a new area. But for the most part the area showing the powdering are the one to address now, so a gallon or two of Hydro-Seal 75 after proper preparation outlined above is worth a shot.
1. Clean surface by washing with TSP and water.
2. Remove as much paint or coating as you can by scraping, chiseling and wire brushing.
3 Apply 2 coats of Hydro-Seal 75 over areas of concern.
4. Look for reoccurrence of efflorescence in other areas of basement where paint could not be removed.
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