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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.

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 pressure wash epoxy floors, but you must take precautions to avoid damaging the surface. While most epoxy floors can be cleaned with a mop, you might choose to pressure wash if the floor is stained, has ground-in dirt, or is covered with mold or mildew. To do so safely, first soak any stains or dirty areas with a gentle cleanser. Use a lower pressure setting with a gentle nozzle, such as a green, white, or black tip, or a 45-degree angled tip. Keep the spray nozzle at least 18 inches away from the floor to protect the surface. Using a surface cleaner attachment or a rotary scrubber can also help prevent overspray. Be cautious if using a power washer that heats the water, as the combination of heat and pressure may be too powerful and could damage the epoxy coating.

Yes, but with caution. A floor grinder is intended to level and polish concrete, so it is a very powerful tool. To remove paint, the floor grinder should be set to 35 square feet per minute or less to minimize the pressure without the use of pocket weights. You might need to go over the surface two times to get any paint that has sunk into the concrete’s pores.