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How to paint masonry walls 
Remove any flaked or peeling paint from the masonry. 
If the wall has already been painted, you need to remove any old paint that is loose, peeling, or flaking away. On an exterior wall, this is most efficiently done with a sandblaster.
In areas where a sandblaster would be too messy and cumbersome, loose paint can be removed with a stiff wire brush and a paint scraper. Failing to remove loose and peeling paint can result in the paint flakes mixing in with your fresh coat of paint and marring the finish.