ACM (aluminum composite material) sign panels are painted with 1-Shot lettering enamels. A hardener has been added to the paint to extend it’s life and add to it’s durability; as this sign gets baked by the sun. Left intact and underneath is the old Albright & Raw Rexall Drug sign, which allowed this extra large sign to be grandfathered in. By adding a small exterior L-shaped bracket to each interior bracket inside the pan shaped panels; I could attach the new sign panels without doing any damage to the near-historic porcelain enamel existing sign.