Crosslinkable compositions contain (1) organosilicon compounds which have radicals containing aliphatic carbon-carbon multiple bonds (2) organosilicon compounds having Si-bonded hydrogen atoms (3) catalysts which promote the addition of Si-bonded hydrogen onto aliphatic multiple bond and (4) agents which retard the addition of Si-bonded hydrogen onto aliphatic multiple bond at room temperature of the formula CH2═C(R2)—CR1(OH)—R  (I) wherein R is hydrogen or a monovalent hydrocarbon radical having 1 to 12 carbon atoms, optionally substituted with one or more hydroxyl groups, with the proviso that R is not hydrogen if R1 and R are both hydrogen, R1 is hydrogen or a monovalent hydrocarbon radical having 1 to 12 carbon atoms, or R1 together with R form a cyclic hydrocarbon radical having 1 to 12 carbon atoms and R2 is hydrogen or a monovalent hydrocarbon radical having 1 to 12 carbon atoms.