Stress buildup in ultraviolet radiation-induced coating can vary significantly as a function of processing conditions. Depending on radiation intensity and photoinitiator concentration, the average stress in the film may either increase or decrease with film thickness. On the basis of the current study on trimethylolpropane triacrylate (TMPTA) together with data reported previously, we conclude that the two main factors affecting stress in radiation curable coatings are (i) degree and distribution of crosslinking and (ii) temperature at solidification point. In certain experimental conditions, an uneven distribution of the conversion within the film may occur, leading to a decrease of the average film stress with increasing film thickness. In contrast, the temperature jump in the sample when irradiated may lead to an increase of the ultimate stress with film thickness.