Abstract: Treated, especially painted, sandwich of two or more joined parts, which a) is fixed with the formation of a spaced joint between the joined parts, where b) fixing of the parts to be joined takes place by means of an adhesive film which can be detached again by pulling in the direction of the bond plane, and c) the thickness of the spaced joint between the joined parts is determined by the thickness of the adhesive film, d) the untreated sandwich fixed in this way is treated in this form, and e) the treated joined parts are separable from one another without residue or damage by pulling on the adhesive film in the direction of the bond plane.