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) Pot Life is 35 minutes and handling strength develops in 16 hours at 73° F / 23° C. MT-13® 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® also maintains holding power under extreme cold conditions.


Safety - Use in a properly ventilated area (“room size” ventilation). Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk.

Store and use material at room temperature (73°F/23°C). This product has a limited shelf life and should be used as soon as possible.

A clean, dry surface is a necessary prerequisite for adhesive bonding. Adhesives will stick to either the surface of which a bond is desired or to that film of extraneous material directly on that surface. Rarely can a structural adhesive penetrate through surface contaminants to provide an optimum bond on an unclean surface.

Porous materials are simple to bond, provided they are dry. The surface should be sanded till clean and free from dust. Nonporous surfaces, such as found on metal and plastic materials, should be degreased, dried and roughened by sanding, sandblasting or chemical etching. The etched or sandblasted surfaces should be covered within a few hours of treatment to prevent contamination.

Epoxy adhesives do not perform well on metals such as nickel, chromium, tin or zinc nor on soft thermoplastics like polyethylene. Refer to the Preparation of Surfaces for Adhesive Bonding technical bulletin.

Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.


Measure equal amounts of Parts A and B (or 100A:123B by weight) and mix thoroughly for 3 minutes to a uniform color (no streaks). Apply to prepared surface at a thickness of 1/32” - 1/16” (0.08cm - 0.16cm). Fit other surface over epoxy and apply even pressure using clamps or weights until material cures.

MT-13® will cure and reach handling strength in 16 hours at room temp. (73°F/23°C). Applying uniform mild heat will cure epoxy faster–150°F/65°C for 4 hours. Let cool to room temperature before moving bonded substrates.