Robnor el420of led encapsulant resin opaque flexible robnor el420of nc el420of is a two part flexible room temperature curing polyurethane resin designed for the potting and encapsulation of led arrays and lighting equipment on curing el420of forms an opalescent finish that masks the underlying components but still retains high light transmission el420of has excellent outdoor weathering properties due to the incorporation of both uv resistant base materials and the addition of uv sta