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Cost and age are two factors to consider when determining if you should repair or replace your concrete driveway. If your existing driveway is on the older side and the cost of repairs is 50% or more of its value, it might be worth replacing it. Replacing a concrete driveway when it's 20 years old and deteriorating in condition will save you from the cost of repairs that likely wouldn’t save it from replacement in a few years anyway.

Yes, using water when drilling concrete can help keep dust from clogging the hole and prevent your drill bit from wearing out, although you don’t need to spray water on the concrete while drilling. Water can also lubricate the bit and help keep it cool since drilling into concrete can generate a lot of friction and heat. 

Factors like the time of day you choose to seal the concrete, temperature, humidity, and airflow will impact drying time. To shorten the drying time, seal concrete in the late afternoon on a day with a temperature between 45 to 85 degrees Fahrenheit.

You should put gravel that is 3/4 to 1 inch under a concrete slab. However, depending on the project, local building codes may dictate the proper gravel size and shape. Some concrete slabs that do not hold significant weight may have a subbase of sand. Also, keep in mind that the subbase you choose will affect the cost of your concrete patio, walkway, or driveway.