Two-part epoxy used to repair SMC, FRP (traditional fiberglass), and other rigid plastic parts. This product is designed for use as a filler and an adhesive. It is epoxy-based for easy sanding and is formulated for excellent featheredging. 3M™ Automix™ EZ Sand Rapid Parts Repair material offers a 10 minute work time and can be sanded in 30 minutes to achieve an excellent feather edge.