Lowviscosity 4306 and medium viscosity 4307 are surface insensitive and bond readily to metals, elastomers, and plastics including olefins. They cure crack-free without solvent-borne accelerators. They have a secondary moisture cure mechanism that lets them cure in shadows where fluorescent light doesn't reach. They also don't bloom and are stress crack-free on sensitive substrates including polycarbonate and acrylic. They bond assemblies in loudspeakers, appliances, medical device, and general industrial components.