Dymonic FC High-Performance, Fast-Curing, Single-Component, Hybrid Sealant Dymonic FC is a high-performance, fast-curing, single-component, low-modulus, hybrid sealant, formulated with proprietary silane end-capped polymer technology. Basic Uses Dymonic FC is a durable, flexible, sealant that offers excellent performance in moving joints and exhibits tenacious adhesion once fully cured.