How to Seal Concrete Paving Stones
Sealing concrete paving stones has many benefits, including protection from stains, color enhancement, joint stabilization, and even an aesthetic boost, as the glossy look after application makes the paved area look more appealing to the eye.
Step 1 – Preparations
Remove everything on top of the paved area, including parked vehicles. Sweep all leaves, dirt and other debris to make sure they do not get in the way. Use a power washer to clean the pores of the concrete paving stones as well as those in between the joints. Scrub the tough dirt away using a stiff broom and wash again with water thoroughly. Allow the water to dry overnight.
Step 2 – Clean Mold and Mildew with Oxygen Bleach
If the paved area is stained by mold and mildew, the best way to get rid of it is by applying oxygen bleach. Mix a good amount of the powdered or concentrated bleach in a plastic bucket filled with water following recommended proportions. Mix the solution and spread it over the stones. Allow the solution to stay for about 10 minutes. Clean the stains with the stiff broom, and wash the residue with water thoroughly.
Step 3 – Apply the First Coat of Sealant
Be sure to purchase a sealant that is designed for paving stones. For the first coat, the mixture should be thin enough to penetrate the pores of the stones. Do this by mixing 2 quarts of Xylene for every 5 gallons of sealant. Mix the solution thoroughly. Pour some of the sealant into a paint roller pan. Apply the solution over the concrete paver stones using a paint roller and let it seep through the pores and joints. Allow the first coat to dry overnight. It usually takes about an hour for the coated surface to be able to bear foot traffic, but make sure that it does not get a lot of traffic while it is still curing. Clean the coating materials immediately after applying the first coat.
Step 4 – Apply the Finishing Coat
To get a glossy result and maximum sealer protection, apply the second coat without the Xylene. Prepare the sealant in a bucket, place some in the paint roller pan, and begin the application process. Make sure all surfaces and joints are treated evenly. After finishing a row, double check for any missed spots. It will be harder to seal missed spots when the paved area is coated entirely. Clean the sealing materials immediately after application. It will take about 48 to 72 hours for the sealant to cure completely. Similar to the step above, make sure that the sealed area does not receive a lot of traffic during the curing phase. After sealing the concrete paver stones, make sure to maintain it by cleaning regularly. When cleaning with a power washer, be careful not to put too much pressure. Reseal the area after 2 to 3 years, depending on the amount of traffic it receives.