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Ask the Expert Question-and-Answer Archive by Ron Joseph November, 2004 Concrete Stains Q. I have a concrete slab I stained with bears stain and now I want to change it. Can i just stain over it? Stains used on concrete slabs are formulated with high pigment and low binder solids which means that stains are similar to regular paint but contain more thinner products than paint. Therefore, a stain will penetrate deeper into the surface than a regular paint. The point is, yes, you can change the color of the original stain by applying another coating of the new stain with some compromise. You may have trouble applying a lighter colored stain from the original stain and you must consider the drying time for one coat of stain and the time for one coat of stain and the time for two coats of stain. Most important is to use the same brand of stain. When preparing any surface for the application of paints or coatings, be certain to take precautions to protect against breathing in any air borne dust particles or debris that may be created by the prep work. Please be aware that paints, coatings and solvents are chemicals and therefore you should always pay attention to proper handling procedures and be prepared to wear protective clothing, such as respirators, gloves, coveralls, etc. For further information on the health and safety requirements for the coatings and solvents you wish to use we strongly advised you to contact your local coating supplier. If possible, go the extra step and look for this information on the website of the product vendor.
Jim Burke
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