In the year 2018, we have implemented a control system for cavity preservation station at Skoda plant in Mlada Boleslav. Its aim is to provide protection of interior spaces inside car bodies against corrosion. During the process car bodies are preheated in the oven, transported into flood basin, where liquid hot wax is automatically applied into their cavities via nozzles. The excessive material gets into the collective tank, from where it can be reused. After cooling on car bodies remains a protecting thin layer of hardened wax.