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Coatings 2017, 7(2), 18; doi:10.3390/coatings7020018

Influence of the Distribution of a Spray Paint on the Efficacy of Anti-Graffiti Coatings on a Highly Porous Natural Stone Material

Institute of Archaeological Heritage-Monuments and Sites, CNR–IBAM, Prov.le Lecce-Monteroni, Lecce 73100, Italy
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Academic Editor: María J. Mosquera
Received: 22 November 2016 / Revised: 10 January 2017 / Accepted: 20 January 2017 / Published: 24 January 2017
(This article belongs to the Special Issue Anti-Graffiti Coatings)
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Abstract

Graffiti on facades often has a heavy impact in social and economic terms, particularly when historical and artistic artefacts are affected. To limit the damages to the surfaces, preventive plans are implemented and anti-graffiti coatings are used as a protective measure. In this study, the distribution of a spray paint inside a highly porous stone, with and without anti-graffiti protection, was investigated. Two commercial sacrificial anti-graffiti systems were used and an acrylic-based paint was applied as staining agent. Environmental scanning electron microscopy and energy-dispersive X-ray spectroscopy (EDS) microanalysis were performed to characterise, from the morphological and chemical point of view, the anti-graffiti coatings and the paint. Maps of the main elements were acquired to locate the different products inside the stone. Chemical removers were used to clean the stained surfaces, then the effectiveness of the cleaning was assessed by visual observations and colour measurements, as well as on the basis of percentage of residual stain. The obtained results highlighted that the anti-graffiti efficacy strongly depended on the characteristics of the applied coating. This latter usually acted as a barrier, but good results were obtained only where the stain did not remain as a separate layer, but penetrated the protective coating. Microcracks in the anti-graffiti coating were able to nullify the protective action. View Full-Text
Keywords: stone protection; anti-graffiti efficacy; coating characterisation; ESEM-EDS; colour measurements; chemical cleaning; Lecce stone; acrylic-based paint stone protection; anti-graffiti efficacy; coating characterisation; ESEM-EDS; colour measurements; chemical cleaning; Lecce stone; acrylic-based paint
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Masieri, M.; Lettieri, M. Influence of the Distribution of a Spray Paint on the Efficacy of Anti-Graffiti Coatings on a Highly Porous Natural Stone Material. Coatings 2017, 7, 18.

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