Color Staining Old Concrete
For older, exterior concrete (more than 15-20 yrs old) acid stains may not work because much of the free lime has leeched away. Acrylic stains are great for old concrete because of its increased porosity over time. Acid stains work well with newer concrete because of the availability of free lime. If repairs need to be made such as patching pop outs or scaling, then acrylics may be the better choice to help disguise the repairs. Any patching materials will stand out with acid stains. For smooth trowelled interior surfaces with less porosity, acid stains are usually better because they don’t require as much penetration to color the concrete.
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