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You can paint over old paint on a concrete porch. For the best results, you should first clean the surface and remove as much paint as you can. A power washer is helpful here, but you’ll also want to scrape as much of the old paint away as possible. Then you should prime the porch before repainting it.

The cost to replace a driveway coating ranges from $275 to $850, or $550 on average. Naturally, larger driveways cost more than smaller driveways. The type of driveway sealant and the number of coats also impact the cost. Coal tar sealant costs the least, while latex acrylic sealant costs the most. Oil-based sealants fall in the middle. 

Most concrete sealers take about one to three hours to dry. However, those that penetrate may take up to 48 hours or more to completely dry. You can find specific drying details from the manufacturer on the label.

In most cases, yes, sealing concrete will stop spalling. However, it’s not a perfect solution—it may only delay spalling. Call your local concrete repair contractor for quotes on the best sealing options to prevent spalling.