Structure/fiberglass Primer Epoxy for System VI. To be used with metal, fiberglass, and composite materials. Should be mixed with Epoxy Primer Catalyst, SF820, before using. Mix ratio 2:1. Spray can chromate primers are not suitable, as they will be affected by the solvents. Unopened – Shelf life is 7 years. Opened – Shelf life is 1 year. Pot Life: 1 hour, Allow 30 minutes between coats. Dry time: 8 hours. Temperatures must be above 65 degrees to cure; 70 degrees is ideal. Available in quarts and gallons.