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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.

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.

Sandblasting is a common method for removing paint. It works great if the underlying material is tough. This is because you can then use more abrasive sandblast materials, making the paint removal process much faster and less expensive. If you plan on removing many layers of paint on smooth surfaces, you’ll need to be more careful about which materials you choose to use to sandblast.

To remove paint from brick with vinegar, you can use the vinegar in much the same way you would paint stripper. However, vinegar needs significantly more time to soak into the paint. Apply the vinegar with a spray bottle, let it soak in, then scrub the paint's surface.