If you’re hand-washing your plastic-backed letterpress plates, you’ll want to use our rigid mounting rubber. Plastic-backed plates curl up when wet. To keep them flat for a complete washout when hand-washing them, press your exposed plate on our rigid mounting rubber. Place this rigid panel with the attached plate in a basin of room temperature water, and then scrub with a wash out brush. After you’re done washing out a plate, remove the plate then squeegee the mounting rubber dry so it’s ready for the next plate you process. Available in 9×12 or 12×18.