PURPOSE: To provide the titled compsn. which does not stain other substrates in contact therewith after curing, consisting of a specified organopolysiloxane, a (partially hydrolyzed) silane and an organotitanate.

CONSTITUTION: 0.5W30pts.wt. silane of the formula [wherein R is alkyl, alkenyl, phenyl; X is a group of CR21=CR2 (where R1 is a monovalent hydrocarbon group, R2 is a bivalent hydrocarbon group)] such as methyltri(dimethylketoxime) silane or partial hydrolyzate thereof and 0.005W2pts.wt. organotitanate such as tetraisopropyl titanate are blended with 100pts.wt. organopolysiloxane contg. two or more terminal silanol groups, having a viscosity of 1,000W200,000cSt at 25°C, and a fraction content [having an MW of 5,000 or below (in terms of polystyrene as measured by means of gel permeation chromatography)] of 2wt% or below.