posca_usa x secretwalls BITE SIZE TUTORIAL “THE SPRAYCAN EFFECT” 🎨 POSCA Uni-Versity Artist instructors angelonce + goopmassta share one of their secret techniques for a unique splatter effect 💨 Grab some Posca markers and try this at home ✨ #secretwalls #poscausa #posca #uniusa #uniball #howto #tutorial #art #artist #illustration #painting #artworkshop #drawing