Smooth-On MT-13® is a premium performance epoxy for applications requiring maximum holding power and water resistance. MT-13 is a two component epoxy adhesive cement which is mixed in equal parts by volume (100A/123B by weight) and gels in a few hours. It develops handling strength in 16 hours and adheres extremely well to both porous and non-porous surfaces. MT-13 is widely used by the boating industry for assembly and general repair.MT-13® Epoxy Adhesive - 16 hour cure time