Bob Smith Industries MID-CURE 15 minute epoxy is used in larger areas where more working time is needed. It is more water resistant and can be used as a substitute for QUICK-CURE in most applications. MID-CURE is Bob Smith's most flexible epoxy and is ideal for gluing to fiberglass surfaces. Allow 45 minutes before handling parts and 2 hours for full strength. Bob Smith's Mid-Cure 5 Minute Epoxy is known to discolor and turn yellow as it ages. Keep this in mind when using it for certain applications. Bob Smith Industries Mid-Cure 15 Minute Epoxy works best on Hard Woods and Fiberglass, while working great for Balsa Wood, Soft Wood, Fiberglass, Ceramics, Hard Plastics, Glass & Metal, White Foam and Reinforcing applications. Refer to the chart below for product uses.