The monomer materials utilized are relatively low in molecular weight, between 150 and 1,000 and preferably in the range of 200 to 300 and have vapor pressures between about 1x10-6 Torr and 1x10-1 at standard temperature and pressure (ie.,relatively low boiling materials). A vapor pressure of about 1x10-2 Torr is preferred. Polyfunctional acrylates are especially preferred. The monomers employed have at least two double bonds (ie., a plurality of elofin groups). The high-vapor-pressure monomers used in the present invention can be vaporized at low temperatures and thus are not degraded (cracked) by the heating process. The absence of uncreative degradation products means that films formed from this low molecular weight, high-vapor-pressure monomers have reduced volatile levels of components. As the result, substantially all of the deposited monomer is reactive and will cure to form an integral film when exposed to a source of radiation. These properties make it possible to provide substantially continuous coating despite the fact that the film is very thin. The cured film exhibits excellent adhesion and is resistant to chemical attack by organic solvents and inorganic salts.