60 days before painting and atleast 30 days for new concrete. 60 days
Wait 60 Days. It's wise to let concrete cure for 60 days before painting, according to the Valspar paint company. After the concrete dries, Valspar and Sherwin Williams both say you should acid etch the concrete so paint will adhere to it. Curing New Concrete. New concrete is very alkaline with a pH of 12 to 14. It also has high moisture content. These characteristics will interfere with paint adhesion, leading to bubbling and peeling. Test the pH level of new concrete by applying distilled water to the slab. Wait 60 seconds and dip a strip of pH indicator paper in the water. The color will change. Covering new concrete with epoxy paint protects it from damage such as erosion and staining. Concrete as a construction material has special physical and chemical attributes that you should take into account if you want to have an attractive, long-lasting paint coating on new concrete. Test the pH level of new concrete by applying distilled water to the slab. Wait 60 seconds and dip a strip of pH indicator paper in the water. The color will change. At 28 days concrete has usually cured to nearly its maximum strength. For a concrete footing in a residential environment say a deck or home the concrete will usually cure for a minimum of three days before the formwork is removed and the rest of the structure is built. Answered by The Community. Making the world better, one answer at a time. If you're dealing with a new slab, you must wait a minimum of 28 days, preferably two months, for the floor to cure and dry thoroughly before applying a garage floor coating. Check pH Level. You want the pH of your new concrete to be 9 or less for good adhesion. Test the pH level of new concrete by applying distilled water to the slab. Wait 60 seconds and dip a strip of pH indicator paper in the water. The color will change. Prior to the 28 days concrete still has moisture in it that weakens the strength of the concrete. If you seal it prior to 28 … days there is a chance you will be sealing in some of that moisture and hence weakening the integrity of the concrete. If you poured your concrete in the middle of dry summer then 14 days should be the minimum amount of time you should wait. After you seal the concrete (depends on conditions and sealer product) you will typically want to give the sealer 1 day prior to walking on it and 48 hours after application before driving on it. Wait 30 Days. New concrete should cure for at least 30 days before being painted, according to Sherwin-Williams. However, even if that time frame has passed, the paint company recommends testing for moisture. Do this by duct taping a 2-foot-by-2-foot piece of plastic to the floor or wall. It's wise to let concrete cure for 60 days before painting, according to the Valspar paint company. After the concrete dries, Valspar and Sherwin Williams both say you should acid etch the concrete so paint will adhere to it. Moisture and Alkalinity. Too much moisture in new concrete can cause paint to bubble. It usually takes at least 30 days for moisture to dissipate enough for paint to adhere. You can test for moisture by taping a piece of foil to the surface, sealing all the edges with tape, and checking for condensation after 24 hours. If there is no condensation, the concrete is dry enough for painting. High alkaline levels also can stop paint from sticking to the concrete. It can take anywhere from 30 to 90 days for alkaline levels to drop enough for painting. Test the pH, and look for levels 9.0 and 10.0.
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how long does concrete have to cure before painting