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It’s best to use a slightly slower-working paint remover that is safer to use, such as mineral spirits, because the strongest spray paint removers are often also the most toxic. Many of these products contain dangerous chemicals, such as methylene chloride, which the EPA banned for most uses in April 2024 after it was established as a major carcinogen.

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.

While a pressure washer is certainly powerful enough to remove old and peeling paint, this is not a great idea to do yourself. The pressure washer is so powerful that you could actually damage the walls as you strip away the paint. It’s best to leave paint stripping to the pros. 

Some methods of removing paint from metal that use physical force, like scraping or grinding, may damage the metal. Other methods like chemical strippers or acids are unlikely to damage the metal underneath, but take care using any method to strip paint to minimize the chance of damage.