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Yes, you can technically use a pressure washer to remove paint from brick, but it comes with a significant risk of damaging the brick surface. A high-power pressure washer can be fast but may leave the brick looking unsightly. The recommended method is to first apply a chemical paint stripper, following the product's instructions, and then use a stiff metal bristle brush or a pressure washer on a low-pressure setting to remove the loosened paint. Due to the risk of damage, it is often best to hire a professional who can use low-stress methods.

Yes, you can paint over old exterior paint, but success depends on the condition of the existing paint and proper surface preparation. If the previous coating is in good shape (not cracked, peeling, or flaky), you can paint over it with less prep work. However, for the most durable and professional-looking results, follow these key preparation steps:

• Clean the Surface: Thoroughly clean the exterior to remove all dirt, grime, and mildew. A pressure washer can be very effective for this.

• Scrape and Sand: If the old paint is peeling, cracked, or flaky, you must scrape off all loose paint. After scraping, sand the surface to create a smooth, even base for the new paint. Sanding is especially important for wood siding.

• Apply Primer: Using a quality exterior primer is highly recommended. It ensures the new paint adheres properly, improves durability, and provides a uniform finish. If you are painting a lighter color over a dark one, a tinted primer will help cover the old color more effectively.

Some brands offer paint-and-primer-in-one products for convenience. Taking the time to prepare the surface properly will not only increase your home's curb appeal but also help protect your siding and extend its life.

You can apply waterproofing over paint, but you won't get as much protection as you would if you painted the surface with a waterproof paint from the get-go. Not all waterproofing methods are compatible with painted surfaces, and they may not adhere well. This is especially true if the paint is glossy, old, or flaking. Waterproofing sealers are primarily meant to be applied to porous surfaces, like concrete, wood, or brick. 

Professionals may use a variety of methods to remove old paint from surfaces, often depending on the size and complexity of the surface. Paint scraping in combination with a chemical paint stripper is the most common method, but experts might also use heat or steam to loosen everything before peeling the paint off. Some might just sand off the old paint if the surface is relatively flat and easily accessible.