Dynasylan SIVO 121 Silane Degussa-Silanes Hydrophobing agent Wood & Furniture Coatings DYNASYLAN® SIVO 121 is a multifunctional, nearly VOC-free, water-borne silane system. It can act most prominently as a hydrophobizing or olephobizing agent for plain wood surfaces or weathered, originally scumble paint treated wood surfaces. DYNASYLAN® SIVO 121-containing wood preservation agents can be painted, rolled or sprayed. In a spray application it is mandatory to minimize the generation of Aerosol emissions by suited procedures. Multifunctional, nearly VOC-free, water-borne silane system. Used for plain wood surfaces or weathered, originally scumble paint treated wood surfaces.