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concrete stain
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A. Preparation of Existing Concrete Surface
Curing agents, sealers, paints, coatings, waxes or water repellents must be removed prior to the concrete acid stain application. Curing agents are products that are sprayed on the concrete after it is poured to help hold in moisture during the curing process. You may not be aware that they are there.
An easy test to find out if they are there or if there is any kind of sealer on the concrete is to pour a small glass of water onto the concrete surface and spread it around so that it coverage approximately 1-2 sq. ft. . Let the water sit for about 5 minutes and then check to see if it is absorbing into the concrete or is just beading up on the top.
A good indication that it is soaking into the concrete is a slight darkening of the color of the concrete.
Mechanical methods of removal are not advised as they may scratch the surface leaving unsightly patterns of scratches in the surface.
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