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July 7 - July 20, 2014

What is the best way to remove graffiti from the surface of historic stone masonry on a church while preserving the appearance properties of the substrate?

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From Jack Margraf of BioReTec on August 21, 2014:
I have used either crushed glass or walnut shells to abrasive blast at a low pressure followed by a waterborne chemical removal and wash. Sponge blasting also works well.

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Tagged categories: Churches; Graffiti; Historic Preservation

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