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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 is an effective way to remove glue and other sticky residue from many surfaces, including wood. Spray the WD-40 on the area, allow the product to sit for a few minutes, then carefully wipe away the residue. As with other adhesive removal methods, test the WD-40 on an inconspicuous spot first to ensure it won’t damage the finish. 

Yes. It's another reason many people choose to use the spray over an adhesive, as they can change patterns or remove it entirely with ease if they choose. You can use acetone with a rag or a vinegar and water solution (1/2 cup of vinegar to 12 ounces of water) with a cloth to help you scrub away frosted spray glass. NEVER mix these two methods together, though, and always work in a well-ventilated area.

You don’t necessarily have to remove all the old paint before repainting your deck, but it’s best to remove as much as possible to ensure a smooth and long-lasting finish. Prioritize scraping off loose, peeling, or flaking paint, and sand down rough areas to create a smooth surface for the new paint to bond with.