An atomizer adapter for application of heavy viscous material from an airless paint sprayer. The adapter includes a housing that is coupled to the output of the sprayer through one housing port by an elongated tube that delivers viscous material and to the output of an air compressor through another housing port that delivers compressed air through a conduit. A nozzle within the housing directs pressurized air into an internal chamber where it is directed at and atomizes the flow of viscous material prior to output through an aperture in a tip fixed to the housing.