Composite shells of revolution are widely used as pressure vessels, reservoirs and tanks, rocket, spacecraft parts and in different elements of the building. The aim of this study is to investigate the buckling and post-buckling behavior of the cylindrical shell made of mild steel filled with melted waste polymer, polypropylene, filled with the silicon and the steel adhesive. Furthermore, seven thin-walled cylindrical shell specimens with different composite cover subject to hydrostatic pressure were tested in the present work. The results of testing under different theories and codes are compared. Also, one specimen was without composite cover (perfect model), which used to check other specimens. This study shows that the initial buckling value of all other specimen tests was higher than the perfect specimen and double layer CFRP coiling have a significant effect on the initial buckling value. However, using material between two cylinders instead of CFRP wrapping increased initial buckling value compared to the perfect specimen. The use of melted PP was more effective than other materials (silicone, steel adhesive glue and waste polymer).