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Ask the Expert Question-and-Answer Archive by Ron Joseph July, 2004 Painting Concrete Floors Q. I have recently built a house in SC with an unfinished basement (concrete floors). I would like to reduce the concrete dust by painting the floors. The floors have never had anything applied to them. One area of the floor is not smooth, the concrete didn't set properly and there is some rough area. Is there anything I should apply before using concrete paint that could smooth this area? Also, besides cleaning the floor, is there any other prep work before painting? Thanks for your help. A. Your description about a rough area in the concrete floor, that needs filling before painting. Roughness that measures about 1/8th to 3/16 in. deep can be filled with concrete patching material. Usually mixed with water and poured into the patch area and just prior to setting can be smoothed with a putty knife or trowel. Allow the patch to dry for several days before you clean the entire area with a vacuum to remove all dust contamination. You may first apply a layer of paint to the patch area which will penetrate and seal the patch before finishing the remaining area. Best regards,
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