L-1 is a universal light-curing 1-component lacquer for surface sealing of hard earmoulds and IE shells. Due to its optimized flowing and adhesion characteristics a homogeneous and high gloss finish is realized. The surface is scratch resistant and can be easily cleaned. The newly developed additive system is matched to the demands of the acoustician and guarantees highest yellowing protection against longterm UV-irradiation. The lacquer is available in a broad variety of colours in order to provide additional solutions for IEM manufacturing.