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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.

It’s a good idea to sand your porch before painting. This will remove loose or chipped paint and debris, and give you a cleaner surface so that your new paint goes on smoothly. But if the existing surface is in good condition, it’s not necessary to sand your porch before you paint.

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.

Professional painters often use a Turpentine-based solution to remove paint, since it can remove oil-based paint as well as acrylics and varnishes. It’s also an organic material derived from tree resin, so it’s less toxic than traditional paint strippers. Consult a professional cabinet refinisher or painter about the best materials to use for paint stripping.