A reaction composition contains: (a) an allyl polyether having the following formula: CH2=CHCH2O-Aa-B where, (i) subscript a is 2 to 170; (ii) A is selected from: –CH2CH2O-; -CH2CH(CH3)O-; -CH(CH3)CH2O-, CH2CH(CH2CH3)O-; -CH(CH2CH3)CH2O-, -CH2CF(CF3)O-, -CF(CF3)CF2O- and -CF2CF(CF3)O-; and (iii) B is selected from –H, -CH3, -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3, –C(O)CH3, and -CF2CF2CF3; (b) A silyl hydride functional siloxane comprising the following siloxane units: [R2HSiO1/2]m[R2SiO2/2]d[RSiO3/2]t[SiO4/2]q where d+t+q is one or more and wherein: (i) R is selected from hydrocarbyl groups having from one to 8 carbon atoms; (ii) subscript m is 2 or more; (iii) subscript d is zero to 20; (iv) subscript t is zero to 2; (v) subscript q is zero to 2; and (c) a platinum-based hydrosilylation catalyst; where there are at least 4 molar equivalents of silyl hydride functionalities relative to allyl functionalities in the reaction composition.