Abstract: A method for producing a composite product including a plastic body and a covering layer formed from a metal blank which at least over part of its surface is stuck to the plastic body, wherein—the metal blank is placed in a die, which die includes a blank holder, a mandrel which can move with respect to the blank holder, and a support die,—the die is closed, so the support die and the mandrel are located on either side of the metal blank, and the metal blank is supported in the vicinity of its edge with the aid of the blank holder,—a liquid plastic is injected into the die, the liquid plastic being brought into contact with the metal blank,—the liquid plastic being converted into a solid plastic body stuck to the metal blank to produce the composite product,—the composite product is removed from the die.