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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.

If you recently splashed paint on the wrong area of a wooden object, remove it with a solvent or caustic paint stripper. Some paint that has yet to dry may be removable by hand with coarse sandpaper or a plastic scraper. Another trick for removing dried-on paint is rubbing a dab of nail polish remover on the paint to remove it, but avoid touching the bare wood surface.

One of the most significant benefits of hiring a professional painter is that they complete the task faster and better. Generally, it takes about a day to paint a room, depending on dry time. If you're painting your entire house or the exterior of your home, that's a lot of time spent with a paintbrush in hand. Outsourcing this project to a painting pro will save you countless hours.

Other benefits of hiring a professional painter include:

• Quality experience with painting 

• Assistance with choosing colors

• Using the right tools for the job

• Extensive product knowledge

Paint removal is a time-consuming job that can take anywhere from an hour for small surfaces, like a single stair banister, to multiple days for larger projects, like removing paint from wood siding. Expect to spend between five and 20 minutes per square foot. You can use chemical paint strippers to speed up the process, but be sure you use proper protective gear and take care to pick a product that’s suited for your material.