It is in the chalk lines that are used by the different construction trades. Outside a broom finish will be better for traction though it will have more of a stone like appearance, as where a rock salt finish will give you more of a marble look.ĭo not allow markers and especially not red chalk to be used on the concrete. Inside a nice smooth finish will be fine, just don't overdo it as too tight of a slab makes it harder for the stain to penetrate which may lead to needing to do a second coat of stain. Curing agent will usually scrape off like a waxy substance.Īnother thing is the finish. To check for curing agents, get down on the concrete and scrape it with a pocket knife. A great complement to the sample pieces of concrete are concrete stain sample kits allowing you to try out our stain before making a larger investment.Īlso when pouring new concrete, be sure to use NO curing agents. If pouring fresh concrete that is intended for concrete staining, be sure to have a few sample size pieces made at the same time to use for testing later. When doing more than one coat of stain, there is no need to wash the residue between coats, just ensure the concrete has completely dried.Ĭoncrete that is very old, has been sanded or grinded will reduce the coverage of the stain and the sealer. While the concrete is still damp from washing the residue, this is what it will look like if sealed. You will not know what color it will actually be until the reaction time has passed, and the residue which hides the real color has been washed. This is the beauty of acid stain and also why you must always do a test in an out of the way place.ĭisregard the color of the acid stain in the bottle, when it is applied to the concrete, and during the drying stage. If you were to pour stain out of the same bottle onto 10 different slabs of concrete, then you would have 10 different versions of that color. Therefore each stain color will be unique to that particular slab of concrete. The concrete must be 28 days old or at least have cured to one uniform color prior to acid staining.Īcid stain works by soaking into the pores of the concrete, and reacting chemically with the cements, limes, and minerals that are already present in the concrete and randomly dispersed at the time the concrete was poured.
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