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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. 

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.

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.

You can apply stain over peeling stain, but it’s not a good idea. Your old stain will get in the way of your new stain bonding to the wood, so you’re likely going to see the same issue again shortly after application. Your best option is to sand off the old stain and clean the surface thoroughly before applying new stain.