In their original state, cinder blocks are gray, dull, and lifeless. But it only takes a little color to turn this utilitarian building block around.
Basements, outdoor structures, planters, and exterior walls become vibrant and interesting with a few coats of paint. Interior cinder block projects like bookcases, shelves, tables, and desks take on new life when brightened with paint.
Cinder block’s highly porous surface can be a bit tricky to paint. But with the right prep work, you’ll be able to paint cinder blocks almost as easy as painting an ordinary wall.
Before You Begin
The key to successfully painting cinder blocks is priming. Primer creates a uniform topcoat that’s free of pores. Though optional on other surfaces, primer is required on cinder blocks. Use concrete and masonry bonding primer. Do not use wood or drywall primer or self-priming paint.
After priming, you can use ordinary acrylic-latex paint tinted to the color of your choice. Use interior paint on interior cinder blocks and exterior-grade paint on outdoor surfaces.
For highly moist surfaces like basement cinder blocks, purchase elastomeric paint. This durable, elastic paint works well on cinder blocks and other tough surfaces.
When to Paint Cinder Blocks
Apply primer or paint to cinder blocks only in temperatures between 50 and 90° F. Paint the blocks only when they are perfectly dry.
If you need to use a paint stripper, use it only in well-ventilated areas while wearing eye and breathing protection. Use waterproof gloves. Even natural paint stripper is caustic, so observe the same safety precautions.
Source: The Spruce