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The biggest issue with painting your interior walls with exterior paint isn’t the way the paint looks or performs—it’s the lack of ventilation. The higher quantities of VOCs in exterior paint will have a harder time dispersing in an enclosed space, so do everything you can to direct them out—like turning on a fan and opening your windows and doors. Afterward, you can simply prime and redo your walls with interior paint, and no one will know the difference.

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.

Pressure washing is the best way to remove paint that’s already peeling from certain types of vinyl and aluminum siding and some masonry. However, if the paint is largely intact and not yet peeling, or if your siding material can’t withstand the pressure, you may need to use other methods, such as chemical paint strippers, a heat gun, a paint scraper, or sanding.

There are times when you should remove all exterior paint before repainting. This includes when you need to get rid of lead-based paint (which should be done by a pro), or if you need to apply a different finish than what’s already there. Your house may also have too many pre-existing layers of old paint, in which case you’ll be better off getting rid of the old layers first.