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Yes, WD-40 can be used to remove dried paint, including spray paint, from surfaces like metal because it acts as a solvent. To use this method, spray enough WD-40 to completely cover the paint and let it sit for five to ten minutes. Afterward, gently scrub the area with a cloth to remove the paint. Be aware that this method might leave behind a greasy film that can attract dirt.

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.

A traditional German schmear uses mortar, making it unsuitable for adherence to painted surfaces. Professionals recommend removing any existing paint before applying mortar. However, you can rough up the painted surface and clean it to test if the mortar will stick. Remember that the underlying paint's texture and color may affect the schmear's final appearance—so starting with a bare brick wall will ensure the ideal finish.

Professional painters often use a Turpentine-based solution to remove paint, since it can remove oil-based paint as well as acrylics and varnishes. It’s also an organic material derived from tree resin, so it’s less toxic than traditional paint strippers. Consult a professional cabinet refinisher or painter about the best materials to use for paint stripping.