Kinetic studies have demonstrated the reactivity of the first amine for being roughly double that of the secondary amine. Use of a difunctional or polyfunctional amine types A 3-dimensional cross-linked community. Boat builders, surfboard makers and fabricators of all kinds use epoxy each day to type powerful, watertight, lightweight constructions. https://www.propanraya.com/id/produk/epoxy-fast-dry