For example, into a powdery olefine copolymer fluidized by air or other inert gas is dipped a glass bottle which is previously heated at higher than the softening point of the copolymer; the powdery copolymer is adhered to the surface of a glass bottle by means of electrostatic coating technique and then melted by hearing at higher than the softening point of the copolymer; into a solution of the