Purpose: The topic of this research is estimation of coat parameters generate by paint robots. The purpose of this article is to present results of optimization of the varnishing process.Design/methodology/approach: After theoretical analysis of the methods of the optimization, in examinations was used multicriterial with method of the optimization. This method allows for diagnosing the problem of the lacquering process.Findings: Optimization of the process with multicriterial method let for selecting right parameters of the process of painting. The possibility of the optimum technological process choice was proposed. The optimization methods should have more and more meaning in the materials engineering. It is because of many possible technical problems to solutions.Research limitations/implications: The method of optimization such as multicriterial depend on degree of complexity of physical and technical relations of the analysed lacquering processes.Practical implications: The work is an example of analysis of chosen technological process in aspect of its efficiency. It could be helpful to improve a level of total productivity of technological processes by using multicriterial method.Originality/value: This paper is obtained original model for experimental domain of forming parameters and identification of parameters influence in that model.