A polyorganosiloxane rubber coating composition for use as a high-gloss coating on surfaces, the composition comprising a functionalized polydiorganosiloxane polymerizable under suitable conditions to form a coating; one or more additives selected from catalysts or initiators for curing the polymerizable polydiorganosiloxane, adhesion promoters, reinforcing fillers, and inorganic extending or non-reinforcing fillers; whereby the composition is free of solvents or diluents, the viscosity of the polydiorganosiloxane is chosen to allow the composition to be applied by standard techniques to cure with minimal shrinkage and high gloss, wherein the composition is obtained by mixing the following: a) from 10 to 90 weight percent of one or more polydiorganosiloxane polymers of the general formula HO[ 2 SiO] n 2 SiOH in which R is a monovalent alkyl or alkylene radical having 1 to 8 carbon atoms, optionally substituted with one or more halogen atoms, or a phenyl radical, optionally substituted with one or more halogen atoms, and n has an average value such that the viscosity is from 0.00065 to 40 Pas (0.65 to 40,000 centipoise) at 25°C; b) from 0 to less than 90 weight percent of an inorganic extending or non-reinforcing filler; c) from about 0.1 to 50 weight percent of an amorphous SiO 2 reinforcing filler, preferably from 1 to 30 weight percent, and more preferably from 2 to 20 weight percent; d) from 0.1 to 25 weight percent of a cross-linking agent of general formula where R 1 is an alkyl, alkylene or phenyl radical, preferably methyl or ethyl, X is an alkyl radical with a functional group selected from carboxyl, ketoximino, alkoxy, carbonyl or amine linked directly to the silicone atom and m is 0 or 1; e) from 0 to 25 weight percent of a polymer chain extender of formula X 2 -Si-R 1 2 where 1 R is an alkyl, alkylene or phenyl radical, preferably methyl or ethyl, and X is an alkyl radical with a functional group selected from carboxyl, ketoximino, alkoxy, carbonyl or amine linked directly to the silicone atom. f) from 0 to 10 weight percent of an adhesion promoter of the general formula in which R 2 and R 3 are independently selected from monovalent alkyl or alkylene radicals having 1 to 8 carbon atoms or a phenyl radical which may optionally be substituted with an alkyl radical having 1 to 8 carbon atoms, b is an integer between 0 and 3, and R 4 is a saturated, unsaturated or aromatic hydrocarbon radical having 1 to 10 carbon atoms which may optionally contain a functional group; and g) from 0.01 to 5 weight percent of an organometallic salt as a condensation catalyst of the general formula where M is a transition metal, preferably Ti, V, Sn and Zr, R is an alkyl or alkylene radical with 1 to 20 carbon atoms, x and y are integers having a value between 0 and 4. a) from 10 to 90 weight percent of one or more polydiorganosiloxane polymers of the general formula HO[ 2 SiO] n 2 SiOH in which R is a monovalent alkyl or alkylene radical having 1 to 8 carbon atoms, optionally substituted with one or more halogen atoms, or a phenyl radical, optionally substituted with one or more halogen atoms, and n has an average value such that the viscosity is from 0.00065 to 40 Pas (0.65 to 40,000 centipoise) at 25°C; b) from 0 to less than 90 weight percent of an inorganic extending or non-reinforcing filler; c) from about 0.1 to 50 weight percent of an amorphous SiO 2 reinforcing filler, preferably from 1 to 30 weight percent, and more preferably from 2 to 20 weight percent; d) from 0.1 to 25 weight percent of a cross-linking agent of general formula where R 1 is an alkyl, alkylene or phenyl radical, preferably methyl or ethyl, X is an alkyl radical with a functional group selected from carboxyl, ketoximino, alkoxy, carbonyl or amine linked directly to the silicone atom and m is 0 or 1; e) from 0 to 25 weight percent of a polymer chain extender of formula X 2 -Si-R 1 2 where 1 R is an alkyl, alkylene or phenyl radical, preferably methyl or ethyl, and X is an alkyl radical with a functional group selected from carboxyl, ketoximino, alkoxy, carbonyl or amine linked directly to the silicone atom. f) from 0 to 10 weight percent of an adhesion promoter of the general formula in which R 2 and R 3 are independently selected from monovalent alkyl or alkylene radicals having 1 to 8 carbon atoms or a phenyl radical which may optionally be substituted with an alkyl radical having 1 to 8 carbon atoms, b is an integer between 0 and 3, and R 4 is a saturated, unsaturated or aromatic hydrocarbon radical having 1 to 10 carbon atoms which may optionally contain a functional group; and g) from 0.01 to 5 weight percent of an organometallic salt as a condensation catalyst of the general formula where M is a transition metal, preferably Ti, V, Sn and Zr, R is an alkyl or alkylene radical with 1 to 20 carbon atoms, x and y are integers having a value between 0 and 4.