Patco 580 Polyethylene Screenblock Tape. PE/Acrylic PSA tape combines durability, conformability and solvent resistance. Applications Border & blockout tape for the screen printing industry. Cover pinholes and registration marks. Features & Benefits Tough and conformable backing. Excellent solvent and chemical resistance. Good adhesion, and clean removal. Fiber-free, recyclable core. Available in clear & 8 glossy colors.