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A layer of exposed aggregate concrete should be 1 to 2 inches thick if you’re installing it on top of existing concrete. If you’re pouring a new slab with the finish, slab thickness will depend on the application. Exposed aggregate concrete driveways should be 4 to 6 inches thick in most cases or 8 to 12 inches for commercial vehicles. Sidewalks, patios, and walkways should be 4 inches thick.

The biggest downside to resurfacing concrete is its lifespan. Concrete resurfacing lasts for five to ten years, on average, while a new concrete slab would last for 20 to 30. The cost of concrete resurfacing is much lower, but you get more value from full replacement. Resurfacing also doesn’t address any underlying issues with your slab, so you may need additional repairs, like mudjacking.

There are a few different types of finishes to choose from for the final step of the project. 

Water-based polyurethane sealants emit fewer odors and fumes but dry quickly, which can pose a challenge when trying to get a smooth coat. Oil-based polyurethane sealants let out more odors and fumes into the air (it’s especially important to wear a respirator if you choose this type), but they take longer to dry, which can be more forgiving during the finishing step. 

Some may prefer wood oil to polyurethane because rather than creating a layer, it becomes part of the wood. Wood oil takes longer to dry, and is less resistant to wear and tear; however, it creates a natural-looking result by enhancing the grain of the wood. 

Cracks, spalling, uneven surfaces, and weather damage often necessitate professional repair or resurfacing.