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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.

Pressure washing is the best way to remove paint that’s already peeling from certain types of vinyl and aluminum siding and some masonry. However, if the paint is largely intact and not yet peeling, or if your siding material can’t withstand the pressure, you may need to use other methods, such as chemical paint strippers, a heat gun, a paint scraper, or sanding.

First off, take a breath. The good news is that interior paint, especially when used outside, won’t harm your health. The bad news is that you’re going to have to reapply the proper exterior paint at some point in the not-so-distant future. Otherwise the current coat will chip, crack, and fade, or worse, develop mold or an insect infestation without remediation.

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.