Universal Plate Finisher for all aluminum plates, 55-gallon Drum This proven Universal Plate Finisher will protect all aluminum printing plates from oxidation for up to 1-week. This product contains an additive which prevents mold growth, and it will not gum up the processor. This additive called “Plate Prep” which conditions the aluminum non-image area and reduces the roll up time on press by up to 30%. It is available as a ready to use and as a 1 to 4 concentrate. This Metal Plate finisher works with all aluminum Conventional, Thermal, and Violet printing plates.