Exterior breeze block has a grey, institutional appearance that is greatly improved with paint. Whether it's the exposed part of your house foundation, a retaining wall or your home's siding, you have several types of paint to choose from. Your choice is usually determined by the type of breeze block you're painting -- rough or split-face block. If the breeze block texture is very coarse, an elastomeric paint will make it look smoother.
Most 100 per cent acrylic house paints hold up very well on cleaned breeze block. Although some paint companies claim their product is "self-priming" on exterior masonry, meaning that no primer is necessary as long as you apply two coats of paint, the Paint Quality Institute recommends a water-based primer for concrete or breeze block. Depending on the appearance you want, use flat, satin or semigloss paint. The higher the gloss, the more it will accentuate surface irregularities.
A less expensive option is latex masonry paint, which is typically only available in a flat finish but comes in all colours. Latex masonry paint is a little thinner than acrylic house paint, making it easy to apply to very rough surfaces since it penetrates the nooks and crannies well. Apply the paint with a roller and brush or a paint sprayer.
Elastomeric paint is thick and dries to a very tough, long-lasting film that bridges cracks and pores in breeze block. If you want a durable paint job and exterior breeze block walls that are impervious to moisture, prime the block and apply two coats of elastomeric paint. This paint will cost you a little more than acrylic or latex paint but will last much longer. Apply elastomeric paint with a brush, roller or sprayer; since it's quite thick in consistency, you'll need a professional-grade sprayer.
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