Paper or cardboard with porous surfaces have been transformed into oil- and water-resistant surfaces by coating them with nano-PET to fill the pores and increase their ability to absorb oil while keeping the fibers from swelling. Experimental results show that using PET nanoparticle solution as coating for cartoon have a strong effect on its mechanical properties especially as confining properties. Cartoon coated show high resistance against water absorption for cartoon with three layers of paint (two sides) where the ratio reach to 41.7% as compare with 16.4% for cartoon without coating also show high confining properties against two kinds of oils (cooking and machine), where the experimental result for the cartoon with two layers of paint lowest absorption  for cooking oil about  0.018 g compared with carton without coating with 0.122g while for machine oil carton with three-layer paint (two side) show the difference in weight about 0.012g and without coating its about 0.026g. Furthermore, high binding energy between the PET nanoparticle solution with the cardboard molecules, which refers that the compatibility between the surface of the treated carton and the PET polymer has occurred, providing a good adhesion between carton and coating solution.