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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.

While not all homes built before 1978 contain lead paint, enough do, so you’ll still want to test to be on the safe side. The federal government banned lead-based paint for homes in 1978, but your state may have banned lead before that time. Around 24% of homes built between 1960 and 1977 contained lead-based paint, while 87% of homes built before 1940 contained lead-based paint.

The list of what removes caulk residue includes rubbing alcohol. In some cases, rubbing alcohol can also help remove water-based caulk. However, old caulk or caulk that’s in layers from years of upkeep and projects might prove to be too much for simple rubbing alcohol and may require a caulk-removing solution from a home improvement store.  

Paint removal is a time-consuming job that can take anywhere from an hour for small surfaces, like a single stair banister, to multiple days for larger projects, like removing paint from wood siding. Expect to spend between five and 20 minutes per square foot. You can use chemical paint strippers to speed up the process, but be sure you use proper protective gear and take care to pick a product that’s suited for your material.