How To Smooth Cinder Block Walls. Cinder block walls have to to be constructed carefully and with the necessary reinforcement to account for a solid installation. Concrete cinder block walls are sturdy and easy to build, but they can often take your time to make sure that the surface is as smooth as possible.
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Even better than using concrete blocks would be to use interlock paver retaining wall stones. They're not exactly what you want to be staring at when you're trying to find inspiration for that final paper—or celebrating turning in said paper with your new friends! The other side has a decent enough wall that was properly mortared and stuccoed, but this side just had some blocks sort of stacked up lackadaisically. Paint the cinder block wall with a thick coat of masonry waterproofing paint, pushing paint into cracks and crevices of block.