Finish 1 FH611-4 is a fast universal hardener manufactured by Sherwin-Williams for use with primers, sealers, and 3.5 VOC acrylic enamel paints. It is formulated to accelerate drying times, particularly in cooler environments between 60F and 70F, helping ensure proper curing and finish quality. FH611-4 uses a standard 4:1 mix ratio and is compatible with Finish 1 FC720 overall clear coat, FC710 spot/panel clear coat, and factory-packaged 3.5 VOC acrylic enamel colors. The hardener reaches full cure in approximately 24 hours and is suitable for use on metal, wood, and plastic surfaces. This part number refers to the 1-quart container size and is fully 3.5 VOC compliant.
