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January 1 - January 3, 2020

What kind of initial treatment is the best defense against graffiti for rough-surfaced concrete block (CMU)?

Selected Answers

From Jane Armitage of Watertite Sales on January 17, 2020:
You need to protect the concrete so that it can repel the paint. My suggestion would be to apply a crystalline-type product that penetrates the concrete and seals the concrete's capillary system with the exception of the top 1/8th inch. You can then either apply another application of the crystalline product a week later to seal that 1/8th inch, or apply a topical water repellent. In most cases, the crystalline product is resistant to grease, oils, solvents and acids.Thus, if the water repellent breaks down, the crystalline product will only allow the graffiti to penetrate the top 1/8th inch, making removal easier. The 2 applications of crystalline eliminate the water repellent and avoid a maintenance issue with the water repellent.

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Tagged categories: Concrete; Concrete masonry units (CMU); Good Technical Practice

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