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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.
Each type of concrete has it's own characteristics and it will vary slightly from batch to batch. As a rule of thumb, total cure for most concrete is 30 days. You should wait for this period before sealing/coating. Also, when concrete cures, a film forms on the surfaces.ags: Basement & Foundation. Just poured a new 4 slab in the basement 4 weeks ago. Sprayed with water and covered with plastic for a week to wet cure. Then let it dry out on its own for 3 weeks.