Considering specific properties of polymer materials, they frequently replace traditional materials in many of it applications. Thus polymers have squeezed out metals and ceramics also in the bathtub due to many of its advantageous properties, such as corrosion resistance, weight-to-strength ratio, colour design possibilities etc. At the manufacturing of multilayer bathtub items from polymers it is extremely important to ensure good and durable resistance between main material of the bath (such as polymethylmetacrylate, unsaturated polyestetr resins), primer and final coating. Insufficient adhesion between the layers of the multilayered bathtub material (especially near the edges and borings) is one of the main reasons of the spoilage production; additionally it is one of the most important factors decreasing exploitation life of such items, especially in the moisture sensitive environments like bathtub. Among the most crucial factors influencing strength of the adhesion joint in unmodified and reinforced layered polymer composites is macrostructure/surface quality of the coatable area, chemical nature of the contacting materials. These factors could be controled to greater extent by choosing suitable components (typically polymethylmethacrylate (PMMA), fiber reinforced unsaturated polyester, primer) of the multilayered composite used for manufacturing of multilayered bathtub item as well as by using adequate technologies and technical means for pre-preperation of the surface, coating of the primer and preserving of the contact surfaces from the influence of external environment.