HN-5506AB 2:1 UV Resistant Anti Yellowing Crystal Clear Epoxy for LED Signage and Label Doming HN-5506A/B is a two-component high-transparency epoxy crystal glue. It combines low viscosity, excellent self-levelling and built-in defoaming with a long room-temperature pot life, so it fills moulds and housings evenly and releases air without vacuum equipment. After curing it forms a crystal-clear, high-hardness material with strong adhesion, low cure shrinkage, moisture, water,