The present invention provides a non-drying sealer composition which does
not substantially swell or shrink non-polar vulcanized rubber products.
The non-drying sealer composition is suitable for sealing a gap between a
sheet-metal flange and the inside of a trim part by charging the
composition into the trim part of the weatherstrip for an automobile. The
non-drying sealer composition comprises liquid rubber as a sealer base, a
tackifier and a thixotropic agent as auxiliary materials, and a
non-volatile softener (including a plasticizer) as a dispersing medium. As
the non-volatile softer, a shrinking component is used alone or in
combination with a swelling component. Thus the swelling action of the
sealer composition against the non-polar vulcanized rubber product reaches
within about .+-.5% in terms of the degree of swelling.
