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October 9 - October 15, 2016

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

Selected Answers

From Warren Brand of Chicago Corrosion Group on October 13, 2016:
While I haven't used any yet, it is my understanding that there are wax-type paint systems which are sacrificial in nature. That is, when they are damaged, warm water can be used to remove a layer of the paint, along with the graffiti. To try to design a robust, chemically resistant material to resist graffiti, is, IMHO, not an optimal solution. The CMU should be block-filled and painted in whatever style the owners prefer, and the wax-type material applied as the top coat.

From Farooq Ahmed of CSL Silicones Inc. on October 12, 2016:
Use an elastomeric, room-temperature vulcanized, polysiloxane non-sacrificial, anti-grafitti coating. The coating should be thin (low viscosity) enough to fill voids and cavities.

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