Our strongest epoxy, this Ultimate formula has a 4,250 PSI bond strength and sets in just 10 minutes. Gorilla Epoxy Ultimate is also waterproof and versatile, creating a long-lasting, permanent bond to metal, plastics, concrete, ceramics, PVC, fiberglass and more. (Not recommended for use on polyethylene, polypropylene, or similar plastics. Bonded wood materials should not be submerged or soaked in water.). Adhesive Type: Epoxy; Product Packaging: Syringe; Washable/Removable: No; Color on Application: Black.