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The white stains you see on your bricks are likely efflorescence, which is salt and lime buildup. To remove efflorescence stains, simply brush them away with a stiff brush. For larger, more stubborn stains, scrub the stains with a water-detergent solution.

Masonry uses units like bricks, cement blocks, and stone with mortar between them. Mortar is generally made of sand and a type of cement. Examples of masonry include the brick or stone on a house, chimney, or freestanding wall. Concrete is a mixture of water, sand, stone aggregate, and other materials, and is poured into forms or moldings. Types of concrete applications include driveways, garage and basement floors, and poured concrete walls in basements and crawl spaces.

On average, a quality exterior brick stain can last between 10 and 20 years, and sometimes even longer. While it will look its best for a minimum of three to five years, its total lifespan depends on several factors. These include the quality and type of stain used, the condition of the brick, and the thoroughness of the surface preparation, such as proper cleaning. Following the manufacturer's application instructions and applying a sealant as a final step is also crucial. The stain's longevity can be affected by your location, climate, and the brick's exposure to harsh weather, high traffic, and other elements. Over time, the stain may begin to fade or look dingy due to weathering, erosion, dirt, and debris. Compared to paint, brick stain generally has a longer lifespan.

When painting brick, each application method has distinct advantages and disadvantages. Spraying is significantly faster but may not penetrate deeply beyond the surface layer. Rolling is effective for working paint into the brick's texture but can be less effective on mortar joints. If you opt for a roller, choose a thick nap of at least a half-inch to ensure paint gets into all the crevices for even coverage. Using a brush is generally not recommended as it is very time-consuming and provides poor surface penetration. Ultimately, a combination of spraying followed by back-rolling is often the best strategy for a durable and even finish.