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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.

The number of coats you need to apply when whitewashing a surface depends on how opaque you want the final product to be. If you're going for a transparent, barely there look, a single coat or two may suffice. For fuller coverage, you'll want to use multiple coats. Another option is to use a less diluted paint to get a thicker coverage. 

Generally, these steps are included in exterior house painting:

• Prepping and protecting the areas not being painted

• Scraping away loose paint

• Cleaning off dirt, grease, and debris

• Caulking gaps and openings

• Priming with a quality paint primer

• Painting the prepared areas, including trim and accents with chosen paint finish

• Adding a second coat

• Cleaning up the site and disposing of tape, plastic, and drop cloths

For homes in areas with extreme weather, high heat, or intense sun exposure, high-quality acrylic paint is the best option. Acrylic paint is durable, resistant to both heat and cold, and provides a protective barrier with excellent UV resistance. For best results, look for acrylics that contain natural earth pigments, which are better suited for resisting sun damage. While oil-based paint is also durable, it can be prone to fading in high heat and can become too viscous to apply easily in cold temperatures. Additionally, choosing a neutral or light color like gray, beige, or white can help, as these colors absorb less heat than darker shades.