It’s supposed to be Two tone color (ginger and dark brown) and the contrast is hardly there at all. This makes the overall job look blotchy or possibly even devoid of a secondary color in those bare spots. But every time after it rains or gets wet, it takes days under the bright sun to turn back into the light colour. When a stain isn't properly neutralized, the sealer will lose its chemical bond. Sealing concrete can be frustrating! Applying the sealer between 50 … The day they installed the concrete it was hot about 80 degrees and … I cleaned the driveway with Simple Green Concrete cleaner and then pressure washed it and allowed to dry for 24 hours before sealing it yesterday. It looked like hardened cement that had dried on top and was darker in color than the rest of concrete. Scrub the stripped concrete with a stiff-bristled brush to remove as much of the color as you can. Depending on the concrete that was ordered you may have river gravel (smooth rocks) or crushed limestone (a rougher textured rock). And till date, there are still areas especially sidewalk and areas that are close to the wall of our house which doesn't get much of the sunlight even during the sunny days still look unevenly dark … In concrete containing calcium chloride, it is often necessary to wash the area several times. The spots you are seeing are due to the aggregate in the concrete. If the concrete it too wet, flaking occurs because the sealant cannot bond properly to the surface. Problem: Concrete is dark and/or blotchy after sealer is applied Film-forming concrete sealers will darken concrete and leave a glossy shine to some extent, giving the concrete a “wet look." To significantly reduce the risk of solvent pop and allow your concrete coating to penetrate and bond better, use the following strategies. Either way, the aggregate dries at a slower rate than the cement it is mixed with. The concrete was not dry enough when the sealer was applied. The combination of substances become darker as layers of dirt accumulate on top of the stain. A non breathing sealer was … We had a new concrete patio installed this week and after top cast was removed we noticed there was dark concrete streaks in some areas. The concrete stain was not neutralized in advance. Dark spots can be removed with a single washdown of water if concrete does not contain calcium chloride. However, the contractor said once he put the sealer on the concrete (we are going with clear sealer and very shiny finish), the color will be much deeper. Roller marks and their cousins, “lap lines,” are just two of those frustrating problems that can plague professional decorative installers. First, try to apply the oil based acrylic sealer after the concrete has warmed up and the sun is not shining too intensely on the surface. 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