SV 121 is a one-component sealant based on silane-modified polyether resin as the main component, and is an odorless, solvent-free, isocyanate-free, and PVC-free substance. It has good viscosity to many substances, And no primer is needed, which is also suitable for the painted surface. This product has been proved to have excellent ultraviolet resistance, so it can be used not only indoors but also outdoors.