Further development of a test method for anti-graffiti products for concrete surfaces Modified test methods for the performance of anti-graffiti coatings are presented in this report. As a base a test method applied in Sweden since is used which involves outdoor exposure of concrete slabs on which the coatings are applied followed by application of the graffiti and cleaning. The modifications are based on a review of methods existing in other countries, discussions with producers of anti-graffiti coatings and a test program carried out at RISE in Borås. The tests were carried out with two sacrificial coatings and some permanent coatings. In the latter case the graffiti is applied and cleaned ten times. In the existing method, the outdoor exposure is said to be three months. However, it was found that when this exposure takes place, in winter or in summer, greatly influenced the protective capability of the coating. In this project the influence of three different exposures were investigated; three month summer exposure, three month winter exposure and twelve month exposure. The test showed that the three-month summer exposure and the twelve-month exposure gave comparable results. Hence prolonging the exposure period is not necessary. However, very deviating results were obtained after the three-month winter exposure. The evaluation of the protective capability is started with a visual inspection against certain specified assessment criteria on remaining stains and visible marks of graffiti. If the coating met the assessment criteria for the visual inspection, assessment criteria on colour changes measured with a colour measuring device shall also be met. Separate assessment criteria for measured colour changes are used for sacrificial and for permanent anti-graffiti coatings. For a sacrificial coating, the assessment criterium is given in relation to the original concrete surface, while for a permanent coating the assessment criterium is formulated in relation to the exposed surface. It was found that the performance requirement on changes in gloss was irrelevant. In the revised method the selection of colour types and water temperature and pressure used in pressure washing has been modified to be consistent with praxis. The drying between cycles including application of graffiti and cleaning was shortened. The method is divided into two methods; one for sacrificial anti-graffiti coatings and one for permanent anti-graffiti coatings that does not require the use of chemical compounds. The latter method is not applicable to permanent anti-graffiti coatings which need the help of chemical products to give satisfactory cleaning.