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A process for applying a coating to a floor surface and curing that coating after application includes the steps of first spreading a photochemically curable liquid coating in a thickness of from about 0.003 to about 0.006 inches on a floor surface. After the coating has been applied, it is exposed

A process for applying a coating to a floor surface and curing that coating after application includes the steps of first spreading a photochemically curable liquid coating in a thickness of from about 0.003 to about 0.006 inches on a floor surface. After the coating has been applied, it is exposed to ultraviolet radiation at a power level of about 40 watts per inch of width of coating being cured and at two different sequentially applied wavelengths. This cures the liquid coating instantly to a durable solid coating. The first applied ultraviolet radiation may have the wavelength of about 365 nm and the second applied ultraviolet radiation may have a wavelength of about 254 nm. The ultraviolet radiation is provided by an array of UV lights on a mobile, self-powered vehicle which moves over the floor coating at a speed in the range of 20 to 40 feet per minute.

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[ The embodiments of the invention in which an exclusive property or privilege are claimed are defined as follows:] [1.] A process for applying a protective and/or decorative coating to a floor surface under ambient air conditions, including the steps of:spreading a liquid coating on a floor surface

[ The embodiments of the invention in which an exclusive property or privilege are claimed are defined as follows:] [1.] A process for applying a protective and/or decorative coating to a floor surface under ambient air conditions, including the steps of:spreading a liquid coating on a floor surface under ambient air conditions, said liquid coating being photochemically completely curable in response to the application of only two different wavelengths of ultraviolet radiation,thereafter, under ambient air conditions, moving a source of ultraviolet radiation which provides the two different ultraviolet wavelengths across the floor being coated, so that the liquid floor coating is sequentially exposed first to a longer wavelength ultraviolet radiation, whereby a subsurface portion of the coating is cured as the ultraviolet radiation source passes over the floor surface and second to a shorter wavelength ultraviolet radiation for surface cure of the coating.