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You can paint over cracked paint, but only if you properly sand down the damaged areas. Once the surface is as smooth as you can get it, clean the walls and let them dry before applying a new coat of paint. Painting over cracked paint without sanding or cleaning beforehand will not cover up the cracks and may even make them look worse.

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.

In many cases, professionals can completely remove certain types of smoke damage from walls and ceilings, but it’s only possible if the damage is minor. For more extensive damage from major fires, you’ll likely need to replace the damaged materials entirely. Some items, like upholstered furniture, are much trickier to clean and might need to be replaced even if the smoke damage is minimal.

Penetrating sealer seeps into concrete pores to protect it from moisture and staining, cracking, and mold caused by water. This means you cannot remove penetrating sealers like topical sealers. The good news is that penetrating sealant doesn’t have to be removed before resealing, as most topical sealers must. Instead, you’ll want to buy a compatible penetrating sealant (often the same kind already in the concrete) and apply it. Always follow the manufacturer’s instructions.