High resolution photoimaging with liquid photopolymers of pastelike consistency overlying irregular surface topography such as provided by conductors extending from the surface of a printed wiring board substrate is obtained without air entrapment or starvation of the superimposed liquid polymer. Thus,...http://www.google.se/patents/US4618567?utm_source=gb-gplus-sharePatent US4618567 - High resolution liquid photopolymer coating patterns over irregular printed wiring board surface conductors
