are covered by outer layers 4 of unfoamed polypropylene the drawing is not to scale the frame 6 is a metal frame made of steel or an aluminum alloy for example a form surface 5 of the formwork panel 1 is flush with the frame 2 during its use as a form and during the pouring of concrete the formwork panel 1 is damaged its form surface 5 suffers scratches and similar indentations that are removed by the method according to the invention for this purpose a surface layer of the form surface 5 is removed in the implementation shown in fig1 the surface layer is removed by milling with a milling cutter 7 and in the implementation shown in fig2 by means of grinding with a grinder 8 both are cutting methods milling being a process with a geometrically determined blade and grinding being a process with a geometrically indeterminate blade other methods for removal of the surface layer can also be used for example thermal chemical or electrochemical erosion only part of the thickness of the outer layer 4 is removed so that the reinforcement layer 3 is not damaged this removes scratches and indentations with a depth not exceeding the thickness of the removed surface layer the formwork panel 1 has a plane surface that is milled or ground for example and is uniformly lower by the thickness of the removed surface layer than the frame 2 deeper defects must be repaired i e filled flush with the milled or ground surface with an appropriate material for example by means of plastic welding to the extent that they are not.