SBB-Viadukt, Stützmauer

Legal graffiti wall in Zürich, Switzerland

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SBB-Viadukt, Stützmauer, near Zurich-City

Officially legalized by the city https://www.stadt-zuerich.ch/hbd/de/index/bewilligungen_und_beratung/beratung/graffiti/legal_sprayen.html

Is this wall still safe to paint?