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Concrete first must be scoured clean with a concrete cleaning solution, a scrub brush or a cleaning machine, then allowed to dry before any etching takes place. Never clean a new concrete pad until at least one month of curing time has been allowed at minimum. After all the water has been removed, the pad should have at least 48 hours of drying time before you apply any etching to the surface. If the weather is particularly humid, wait up to 72 hours for best results. There are numerous types of etching materials available for use with concrete, but as a general rule, they only need 15 to 30 minutes of time on the surface of the concrete to work their way down through the initial layer and etch the surface.
Drying time is about 6 hours, at minimum (meaning no one should be allowed to walk on the patio during this time). But wait 24 hours before driving a car onto your patio. Temperature is a factor in the curing (drying) process. The colder it is outside, the longer it will take for the concrete to dry. Rain is your enemy in this project.