Made by Dicor....The industry Leader! Non Sag Formula can be used on vertical or horizontal surfaces 551LSW Helps create a water tight seal along the roofs edges, around air vents, vent pipes, air conditioners and screw heads. Compatible with EPDM sheeting, it offers excellent adhesion to aluminum, mortar, wood, vinyl, galvanized metal and concrete. It improves the ability to continuously seal and remain flexible. UV stabilized to prevent deterioration and discoloration. Will not stain or discolor any material to which it is applied. 10.3 oz per Tube