This invention provides a curable composition, which comprises a RTV silicone and an uncrosslinked or partially crosslinked rubber and/or elastomer providing initial strength to the composition, wherein the ratio of the silicone to the rubber and/or elastomer ranges from 1:2 to 15:1 by weight. The curable composition has improved handling and application properties in addition to good thermal conductive performance, UV and thermal aging performance, electrical insulation performance, and adhesive performance.