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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 best and fastest way to remove paint from a deck often involves combining a chemical stripper with a pressure washer. Gel-based paint strippers are highly recommended because their thick consistency makes them less messy and easier to apply than liquid strippers. After applying the stripper to loosen the paint, you can use a pressure washer to efficiently wash away the residue. When using a pressure washer for this task, it's important to use a low pressure (under 1000 PSI) to avoid forcing too much moisture into the wood, which could lead to mildew or rot.

To fix bubbling paint, scrape away any loose or blistered areas using a putty knife. Lightly sand the surface to smooth out rough edges and create a level finish. Clean the area thoroughly to remove dust, dirt, and any residue. Once the surface is clean and dry, apply a quality primer suited to the material you're painting. Finally, repaint the area, making sure to work in proper temperature and humidity conditions to prevent new bubbles from forming.