Abstract: The sealant composition disclosed herein is favorable for sealing car parts. The sealant composition is charged inside the trim of a weather strip of a car so as to seal the gap between the trim and the plate flange as inserted inside the trim. The sealant composition comprises a liquid rubber as the base component, a tackifier and a thixotropy promoter as secondary components, and a nonvolatile plasticizer and/or a process oil as the dispersion medium.

Abstract: An automobile weather strip having a main body made of a sulfur-vulcanizable ethylene propylene rubber (EPDM) type compound and having a portion designed to be in contact with a sealer when the weather strip is mounted to an automobile. A sealer underlying layer is included that will be in contact with the sealer with that layer comprised of a bondability improving EPDM type compound and coextruded together with the main body. The bondability improving EPDM type compound is based on a blended polymer having a blending ratio:______________________________________ EPDM type polymer 60-96 wt % NBR type polymer 2-30 wt % hydrogenated SBR type polymer 2-30 wt %. ______________________________________A practical bondability can be ensured between the weather strip and the sealer with no pretreatment, such as by buff fabrication, to a portion of the weather strip to be abutted to or in contact with the sealer.