Sealable corrosion protection lacquer for packaging films for packaging aggressive filling materials such as scented cream, oil, fatty emulsion, acidic or alkaline detergents, alcoholic filling materials, in particular for boards based on aluminium, with which beakers or containers filled with such materials are sealed, wherein the lacquer contains: a) at least one solvent, b) at least one reactive binder, c) at least one sealing component, and d) at least one acidic catalyst; characterised in that a) the solvent, the boiling temperature of which lies between +30 and +250°C, is e.g. 2-butanone, methoxypropyl acetate, isopropyl acetate, 1-methoxy-propanol, dibasic ester, cyclohexane, high-boiling alkane C11-C20 or a mixture of at least two of these components; b) the reactive binder has either a glass transfer temperature (Tg) of between 0°C and +200°C and comes from the group of reactive phenol-resol resins, phenol-novolac resins, high-molecular epoxy resins, alkylated melamine resin, hydroxylated copolyester, polyvinyl butyral, cellulose ester or is a mixture of at least two of these components, or the reactive binder has a glass transfer temperature (Tg) of between - 100°C and +200°C and is selected from the group of reactive acid-modified vinyl/vinyl acetate copolymers, epoxy functional vinyl/vinyl acetate copolymer and hydroxy modified vinyl/vinyl acetate copolymer or is a mixture of at least two of these components; c) the sealing component, the glass transfer temperature (Tg) of which lies between - 100°C and +100°C, consists of epoxy acceptable polypropylene copolymer, PP-copolymer/homopolymer blend, PE/PP copolymers ethylene vinyl acetate copolymers, amorphous α-olefins or mixtures thereof; or the sealing component is a graft polymer, one of the components of which has a glass transfer temperature (Tg) of between -100°C and +30°C and the other component of which has a glass transfer temperature (Tg) of between -80 and -60°C; wherein the sealing component consists of a dispersion of methacrylic acid esters/olefin co-polymers; and d) the acidic catalyst is selected from the group of inorganic acids, e.g. phosphoric acid, or organic acids e.g. para-toluene sulphonic acid or citric acid or consists of a mixture of at least two of these components. a) at least one solvent, b) at least one reactive binder, c) at least one sealing component, and d) at least one acidic catalyst; a) the solvent, the boiling temperature of which lies between +30 and +250°C, is e.g. 2-butanone, methoxypropyl acetate, isopropyl acetate, 1-methoxy-propanol, dibasic ester, cyclohexane, high-boiling alkane C11-C20 or a mixture of at least two of these components; b) the reactive binder has either a glass transfer temperature (Tg) of between 0°C and +200°C and comes from the group of reactive phenol-resol resins, phenol-novolac resins, high-molecular epoxy resins, alkylated melamine resin, hydroxylated copolyester, polyvinyl butyral, cellulose ester or is a mixture of at least two of these components, or the reactive binder has a glass transfer temperature (Tg) of between - 100°C and +200°C and is selected from the group of reactive acid-modified vinyl/vinyl acetate copolymers, epoxy functional vinyl/vinyl acetate copolymer and hydroxy modified vinyl/vinyl acetate copolymer or is a mixture of at least two of these components; c) the sealing component, the glass transfer temperature (Tg) of which lies between - 100°C and +100°C, consists of epoxy acceptable polypropylene copolymer, PP-copolymer/homopolymer blend, PE/PP copolymers ethylene vinyl acetate copolymers, amorphous α-olefins or mixtures thereof; or the sealing component is a graft polymer, one of the components of which has a glass transfer temperature (Tg) of between -100°C and +30°C and the other component of which has a glass transfer temperature (Tg) of between -80 and -60°C; wherein the sealing component consists of a dispersion of methacrylic acid esters/olefin co-polymers; and d) the acidic catalyst is selected from the group of inorganic acids, e.g. phosphoric acid, or organic acids e.g. para-toluene sulphonic acid or citric acid or consists of a mixture of at least two of these components.