A curable organopolysiloxane composition comprising: a branched organopolysiloxane having at least one silicon-bonded alkenyl group and at least one silicon-bonded aryl group per molecule, and having siloxane units represented by the general formula: RSiO 3/2 where R is a substituted or unsubstituted monovalent hydrocarbon group; a linear organopolysiloxane with both terminal ends of the molecular chain blocked by silicon-bonded hydrogen atoms and having at least one silicon-bonded aryl group per molecule; a hydrosilylation reaction catalyst; and, at least 1 parts by weight relative to 100 parts by weight of the total of components and of a low molecular weight siloxane having at least one silicon-bonded alkenyl group per molecule, represented by the average formula (R 5 3 SiO 1/2) f (R 5 2 SiO 2/2) g (R 5 SiO 3/2) h (SiO 4/2) i where each R 5 can be the same or different and is independently selected from a substituted or unsubstituted monovalent hydrocarbon group, wherein at least one of R 5 per molecule is an alkenyl group, with the proviso that the ratio between alkenyl groups and silicon atoms is from 0.3 to 1, f, g, h, and i are independently 0 or positive, and the weight average molecular weight Mw of the siloxane, as determined by Size Exclusion Chromatography, is less than 1,000 g/mol, wherein component is selected from the group consisting of D Vi 4, M Vi 4 Q, M Vi 6 Q 2, M Vi 3 T, wherein the curable organopolysiloxane composition does not comprise a linear organopolysiloxane having at least two silicon-bonded alkenyl groups and at least one silicon-bonded aryl group per molecule. a branched organopolysiloxane having at least one silicon-bonded alkenyl group and at least one silicon-bonded aryl group per molecule, and having siloxane units represented by the general formula: RSiO 3/2 where R is a substituted or unsubstituted monovalent hydrocarbon group; a linear organopolysiloxane with both terminal ends of the molecular chain blocked by silicon-bonded hydrogen atoms and having at least one silicon-bonded aryl group per molecule; a hydrosilylation reaction catalyst; and, at least 1 parts by weight relative to 100 parts by weight of the total of components and of a low molecular weight siloxane having at least one silicon-bonded alkenyl group per molecule, represented by the average formula (R 5 3 SiO 1/2) f (R 5 2 SiO 2/2) g (R 5 SiO 3/2) h (SiO 4/2) i where each R 5 can be the same or different and is independently selected from a substituted or unsubstituted monovalent hydrocarbon group, wherein at least one of R 5 per molecule is an alkenyl group, with the proviso that the ratio between alkenyl groups and silicon atoms is from 0.3 to 1, f, g, h, and i are independently 0 or positive, and the weight average molecular weight Mw of the siloxane, as determined by Size Exclusion Chromatography, is less than 1,000 g/mol, wherein component is selected from the group consisting of D Vi 4, M Vi 4 Q, M Vi 6 Q 2, M Vi 3 T, wherein the curable organopolysiloxane composition does not comprise a linear organopolysiloxane having at least two silicon-bonded alkenyl groups and at least one silicon-bonded aryl group per molecule. where each R 5 can be the same or different and is independently selected from a substituted or unsubstituted monovalent hydrocarbon group, wherein at least one of R 5 per molecule is an alkenyl group, with the proviso that the ratio between alkenyl groups and silicon atoms is from 0.3 to 1, f, g, h, and i are independently 0 or positive, and the weight average molecular weight Mw of the siloxane, as determined by Size Exclusion Chromatography, is less than 1,000 g/mol, wherein component is selected from the group consisting of D Vi 4, M Vi 4 Q, M Vi 6 Q 2, M Vi 3 T, wherein the curable organopolysiloxane composition does not comprise a linear organopolysiloxane having at least two silicon-bonded alkenyl groups and at least one silicon-bonded aryl group per molecule.