A sealing gel i) in the form of a mixture comprising a diene rubber gel obtainable by cold emulsion polymerization at 5°C to 20°C of at least one conjugated diene in the presence of at least one crosslinker and a second diene rubber gel obtainable by cold emulsion polymerization at 5°C to 20°C of at least one conjugated diene in the presence of at least one crosslinker, or ii) obtainable by cold emulsion polymerization at 5°C to 20°C of at least one conjugated diene in the presence of at least one crosslinker and in the presence of at least one crosslinker, where crosslinkers are acrylates and methacrylates of polyhydric, preferably di- to tetrahydric, C 2 -C 20 alcohols, and crosslinkers are compounds having two or more vinyl, allyl or isopropenyl groups or one maleimide unit, wherein the sealing gel further comprises an extender compound incorporated therein, wherein said extender compound is a liquid elastomer and/or a lubricant oil, a factice and or mixtures thereof, and wherein said sealing gel has a Mooney viscosity (ML1+4) @ 100°C of 30 to 90 MU and wherein the at least one conjugated diene is selected from 1,3-butadiene and the sealing gel has a proportion of cis-1,4-butadiene units of 8% to 17% by weight, a proportion of trans-1,4-butadiene units of 59 to 75% by weight and a proportion of 1,2-vinylbutadiene units of 17% to 21 %by weight, all weight percentages based on incorporated 1,3-butadiene. i) in the form of a mixture comprising a diene rubber gel obtainable by cold emulsion polymerization at 5°C to 20°C of at least one conjugated diene in the presence of at least one crosslinker and a second diene rubber gel obtainable by cold emulsion polymerization at 5°C to 20°C of at least one conjugated diene in the presence of at least one crosslinker, or ii) obtainable by cold emulsion polymerization at 5°C to 20°C of at least one conjugated diene in the presence of at least one crosslinker and in the presence of at least one crosslinker, where crosslinkers are acrylates and methacrylates of polyhydric, preferably di- to tetrahydric, C 2 -C 20 alcohols, and crosslinkers are compounds having two or more vinyl, allyl or isopropenyl groups or one maleimide unit, wherein the sealing gel further comprises an extender compound incorporated therein, wherein said extender compound is a liquid elastomer and/or a lubricant oil, a factice and or mixtures thereof, and wherein said sealing gel has a Mooney viscosity (ML1+4) @ 100°C of 30 to 90 MU and wherein the at least one conjugated diene is selected from 1,3-butadiene and the sealing gel has a proportion of cis-1,4-butadiene units of 8% to 17% by weight, a proportion of trans-1,4-butadiene units of 59 to 75% by weight and a proportion of 1,2-vinylbutadiene units of 17% to 21 %by weight, all weight percentages based on incorporated 1,3-butadiene. crosslinkers are acrylates and methacrylates of polyhydric, preferably di- to tetrahydric, C 2 -C 20 alcohols, and crosslinkers are compounds having two or more vinyl, allyl or isopropenyl groups or one maleimide unit, wherein the sealing gel further comprises an extender compound incorporated therein, wherein said extender compound is a liquid elastomer and/or a lubricant oil, a factice and or mixtures thereof, and wherein said sealing gel has a Mooney viscosity (ML1+4) @ 100°C of 30 to 90 MU and wherein the at least one conjugated diene is selected from 1,3-butadiene and the sealing gel has a proportion of cis-1,4-butadiene units of 8% to 17% by weight, a proportion of trans-1,4-butadiene units of 59 to 75% by weight and a proportion of 1,2-vinylbutadiene units of 17% to 21 %by weight, all weight percentages based on incorporated 1,3-butadiene.