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Does Gas Stain Concrete. Dense concrete surfaces may require mechanical preparation to accept acid stain. Bio-remediates are hydrocarbon eating bacteria that eat the oil and leave behind water and carbon dioxide.
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This is probably the most permanent of all coloring options but is usually limited to eight colors. Apply 2nd coat of same color if desired to darken 5. Let it sit for an hour or 2 and wash it off.
Rather in between damp.
Rather in between damp. Ventilate the area if the stained concrete is inside your garage or home. Water base sealers such as Clear Shield makes the concrete look as it does when damp with water not saturated wet but not dry either. Let it sit for an hour or 2 and wash it off.
