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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.

WD-40 can help remove paint on wood floors, but use it cautiously. Start with a small amount and let it sit for a few minutes, then gently scrape the paint off using a plastic (not metal) scraper. You may want to test it first on a hidden area to ensure it doesn't damage the finish. Professional products specifically designed for hardwood may be a better choice for large or stubborn paint spots.

The easiest and fastest way to remove paint from a surface is to use a chemical paint stripper to loosen the paint and then remove the paint using a paint scraper. You can also speed up the process by making the area as accessible as possible, which could include removing window sashes or taking doors off the hinges.

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.