1B31S is a modified version of 1B31 with improved adhesion to solder masks. 1B31S is a fast air drying, single component, acrylic coating providing excellent moisture and environmental protection for printed circuit assemblies. The final film demonstrates excellent flexibility and is easily repairable. Fluoresces under UV light for ease of inspection. HumiSeal 1B31S is in full compliance with the RoHS Directive (Directive 2002/95/EC).