Use of particulate zinc oxide (d) in an amount of from 5 to 20 weight percent of the total composition to provide rapid deep section cure in a curable sealant composition comprising: a) at least one silanol-terminated diorganopolysiloxane in an amount of from 20 to 85 weight percent of the total composition, the silanol-terminated diorganopolysiloxane having the formula: M a D b D' c wherein a = 2, b is equal to or greater than 1, c is zero or a positive integer; M = 3-x-y R 1 x R 2 y SiO 1/2, wherein x = 0, 1 or 2 and y is either 0 or 1, with the proviso that x + y is less than or equal to 2, R 1 and R 2 are monovalent C1 to C60 hydrocarbon radicals; D = R 3 R 4 SiO 2/2, wherein R 3 and R 4 are monovarent C1 to C60 hydrocarbon radicals; and D' = R 5 R 6 SiO 2/2, wherein R 5 and R 6 are independently chosen monovalent C1 to C60 hydrocarbon radicals; b) at least one crosslinker for the silanol-terminated diorganopolysiloxane(s) in an amount of from 0.3 to 5 weight percent of the total composition, wherein the cross-linker possesses the general formula: (R 7 O)(R 8 O)(R 9 O)(R 10 O)Si where R 7, R 8, R 9 and R 10 are independently chosen monovalent C 1 to C 60 hydrocarbon radicals; c) at least one metal condensation catalyst for the crosslinking reaction, wherein the metal condensation catalyst is a tin or titanium compound; and e) optionally, at least one additional component selected from the group consisting of alkyl-terminated diorganopolysiloxane, filler, UV stabilizer, antioxidant, adhesion promoter, cure accelerator, thixotropic agent, plasticizer, moisture scavenger, pigment, dye, surfactant, solvent and biocide. a) at least one silanol-terminated diorganopolysiloxane in an amount of from 20 to 85 weight percent of the total composition, the silanol-terminated diorganopolysiloxane having the formula: M a D b D' c wherein a = 2, b is equal to or greater than 1, c is zero or a positive integer; M = 3-x-y R 1 x R 2 y SiO 1/2, wherein x = 0, 1 or 2 and y is either 0 or 1, with the proviso that x + y is less than or equal to 2, R 1 and R 2 are monovalent C1 to C60 hydrocarbon radicals; D = R 3 R 4 SiO 2/2, wherein R 3 and R 4 are monovarent C1 to C60 hydrocarbon radicals; and D' = R 5 R 6 SiO 2/2, wherein R 5 and R 6 are independently chosen monovalent C1 to C60 hydrocarbon radicals; a = 2, b is equal to or greater than 1, c is zero or a positive integer; M = 3-x-y R 1 x R 2 y SiO 1/2, wherein x = 0, 1 or 2 and y is either 0 or 1, with the proviso that x + y is less than or equal to 2, R 1 and R 2 are monovalent C1 to C60 hydrocarbon radicals; D = R 3 R 4 SiO 2/2, wherein R 3 and R 4 are monovarent C1 to C60 hydrocarbon radicals; and D' = R 5 R 6 SiO 2/2, wherein R 5 and R 6 are independently chosen monovalent C1 to C60 hydrocarbon radicals; b) at least one crosslinker for the silanol-terminated diorganopolysiloxane(s) in an amount of from 0.3 to 5 weight percent of the total composition, wherein the cross-linker possesses the general formula: (R 7 O)(R 8 O)(R 9 O)(R 10 O)Si where R 7, R 8, R 9 and R 10 are independently chosen monovalent C 1 to C 60 hydrocarbon radicals; c) at least one metal condensation catalyst for the crosslinking reaction, wherein the metal condensation catalyst is a tin or titanium compound; and e) optionally, at least one additional component selected from the group consisting of alkyl-terminated diorganopolysiloxane, filler, UV stabilizer, antioxidant, adhesion promoter, cure accelerator, thixotropic agent, plasticizer, moisture scavenger, pigment, dye, surfactant, solvent and biocide.