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Yes, you should seal your exposed aggregate concrete to keep it protected from the elements and reduce the risk of cracking and concrete spalling. You’ll need to invest in the cost of resealing your concrete about every three years to keep it in good condition. Unsealed exposed aggregate concrete is susceptible to water damage, stains, chips, cracks, and abrasion. Sealers are available in various finishes and levels of gloss. Outdoor exposed aggregate concrete should be sealed with a non-yellowing, UV-resistant sealer to preserve the look of the finish.

The average cost of stamped concrete is around $12 per square foot, but you might pay anywhere from $8 to $28 per square foot. The average 12-foot by 12-foot patio costs $1,730 on average. Your exact pricing will depend on the patio’s square footage, the condition of the area where you want to pour the concrete, the desired stamp pattern, concrete coloring, concrete grade, and local labor prices. Don’t forget to budget for extra costs like land preparation and additional concrete fortifications if necessary.

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. 

Epoxy coatings for concrete basement or garage floors are popular. These two-part resinous coatings are waterproof and highly durable, making them an ideal choice for high-traffic spaces or areas where spills are likely. However, epoxy flooring costs more to apply than concrete stains and doesn't produce a natural-looking finish.