When Shepard Fairey first started putting up posters, he used Elmer’s glue mixed with water instead of wheatpaste, and he wasn’t applying them to walls very well.

It was fellow artist Phil Frost who took Shepard around New York City, taught him how to use wheatpaste, and taught him how to properly apply posters so that they would stay up.

image via (Photographed by: Lord Jim)