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Yes, brick should be clean before staining to ensure the best results. Dirt, dust, mold, mildew, and other substances on the brick can prevent the stain from properly adhering to it. Thoroughly cleaning the brick allows the stain to penetrate and bond to the surface more effectively. Cleaning typically involves using a pressure washer or a stiff brush with mild detergent. However, stubborn residue may require a specialized masonry cleaner.

You should use an angled brush to first paint the mortar lines, then go in with a high-density roller to evenly paint the bricks one at a time. You can also use a flat paintbrush to paint individual bricks, but a roller is faster and easier to use thanks to its longer handle and wider surface area for coating the bricks. To finish, go in with the paint brush for edges or hard-to-reach areas.

The main difference between limewash and German schmear is their core ingredient. Limewash is made from crushed limestone, while German schmear uses a mortar base. This affects their application, appearance, and longevity. German schmear involves applying a thin layer of mortar to brick or stone and then partially wiping it off. In contrast, limewash is a type of paint. German schmear is essentially permanent, lasting one to two decades with minimal maintenance, whereas limewash has a shorter lifespan of five to seven years. Cost-wise, German schmear is about $1 to $4 per square foot and is typically only available in white or gray.

Limewash and whitewash are two techniques used to give brick a light, matte finish, but they differ in composition, application, and permanence. The best choice depends on your aesthetic goals and the specific surface.

Composition

• Limewash: A natural and environmentally friendly option made from limestone, water, and sometimes pigments. It is breathable and soaks into porous surfaces like brick.

• Whitewash: Traditionally made from lime, water, chalk, and binders, but a similar look can be achieved with watered-down white paint. It is paint-based and sits on top of the surface.

Appearance and Finish

• Limewash: Provides a natural, textured appearance that allows the brick's character to show through. It offers a more traditional finish.

• Whitewash: Creates a softer, more opaque finish, often used for a rustic or shabby-chic style.

Application and Permanence

• Limewash: Is semi-permanent and can be removed, making it a good choice if you might want to change the look in the future. It requires more skill to apply and cannot be used on previously painted brick.

• Whitewash: Is a more permanent solution. It is more forgiving to apply and can be used on painted brick. However, because it sits on the surface, it can trap moisture.

Ultimately, if you want a breathable, natural, and reversible finish for unpainted brick, limewash is a great option. If you need a more permanent, opaque coating that can be applied over painted surfaces, whitewash is the better choice. Whitewashing may also be more economical, costing approximately $1.40 to $4.20 per square foot.