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Cinder block surfaces should be free of dirt,
loose mortar, or other contaminants prior to painting:
- If efflorescence is present, remove by
hand wire brushing; wear eye protection and gloves; try to
identify and eliminate any source of water from behind the
block that could have caused the efflorescence
- Scrape out and widen any cracks; brush
out dust, and seal with 100% acrylic or siliconized acrylic
caulk; make second application in several hours if needed;
check mortar joints carefully and repair or re-point as needed
- Treat any mildew with a 3:1 water:household
bleach mixture, leaving it on for 20 minutes and adding more
as it dries; wear eye and skin protection; rinse thoroughly
- Remove dirt, chalk, dust, unbound sand,
treated mildew, etc. by scrubbing with detergent and water,
and rinse thoroughly; or power wash with plain water, taking
care to not drive water into cracks or mortar joints
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