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During the drying process, water bleeds from inside the concrete and settles on top, making a sheen. When this layer evaporates, it indicates that the top layer of concrete is durable enough to resist surface damage. The evaporation process should take about an hour, but monitor the concrete for the right time to begin curing. When the surface water evaporates, then begin the process. A fabric sheet traps water and keeps the concrete moist. Fabrics like burlap and cotton are best. Normal sheets are acceptable as well if you don't have other fabrics. Measure the concrete area to see how much fabric you need, and get a sheet that will cover the whole thing. You can also use multiple sheets for larger slabs. As long as the concrete is covered, it doesn't matter how many you use. Soak the fabric with clean water before placing it down. This removes any solvents or contaminants that could stain the concrete. Find a light-colored fabric if you can, because this reflects the sunlight better than a dark color. Once the concrete is strong enough, unroll the fabric over the entire surface. Make sure all the concrete is covered, including the edges and sides if the concrete is raised. Stand back and look around the perimeter to make sure no concrete is visible. Cover any areas that are still showing. Be careful not to step on the concrete while you do this. It's still not strong enough to support weight. Although the sheet may already be wet from when you rinsed it off, re-wet it so As soon as you lay the sheet down, hose it down completely with water. Continue watering until the entire sheet is wet. Don't spray so much that water pools on the surface. Just enough to wet the entire sheet will work. Using a sprinkler can also work. Place the sprinkler on the center of the concrete if you can reach without stepping on it and let the sprinkler run. If you can't reach the center of the concrete, place the sprinkler on the edge and angle it inward instead. Leave the sprinkler running until the sheet is completely wet. Cover all the fabric and don't let any parts stick out. This covering locks in moisture and helps the curing process. Use light or transparent plastic for temperatures above 60F (16C). Use dark-colored plastic for temperatures below 60F (16C) to absorb more sunlight. Place buckets or similar heavy objects on each corner of the plastic, beyond the concrete edge, to keep it from blowing away. Using a plastic sheet is not a requirement, but it keeps moisture in more efficiently than the fabric alone. If you don't have a plastic sheet, take extra care to keep the fabric sheet wet constantly. Monitor the sheet and re-wet it any time it's drying out. Peel off the plastic, spray the fabric down, then replace the plastic to keep the moisture in. Recheck the fabric multiple times per day for 7 straight days. If you're not using a plastic sheet, the fabric may need rewetting as many as 10 times a day, depending on the temperature. Check the fabric as often as you can and wet it whenever it's drying out. Keeping the concrete constantly wet for 7 days completes the wet-curing process. Once that time passes, peel off the plastic and fabric to finish the job. Remember that at this point, the concrete is still not strong enough to support heavy weights. If the concrete is in your driveway, wait another week before driving your car on it.
Wait until the water sheen evaporates from the concrete surface. Get a fabric sheet that will cover the entire concrete slab. Cover the concrete with the fabric. Hose the sheet down with water to soak it. Spread a plastic sheet over the fabric to lock moisture in. Re-wet the fabric sheet every day for 7 days. Remove the covering after 7 days.