The present invention relates to two-component compositions containing A) hydroxyl-containing polydimethylsiloxanes having number average molecular weights of 400 to 3000 and an average OH functionality of ≧1.8, and containing at least one structural unit of formula I) wherein R is an aliphatic, linear or branched C1 to C20 radical, R1 is a linear or branched hydroxyalkyl radical having 2 to 10 carbon atoms and R2 is either hydrogen or a linear or branched hydroxyalkyl radical having 2 to 10 carbon atoms, B) polyhydroxyl compounds other than A) or polyamines, and C) polyisocyanates. The present invention also relates to coatings, adhesives or sealants obtained from these compositions.