a window trim molding having improved adhesion between the edges of the window and the window - gripping portions of the molding . this is accomplished by co - extruding with the principal molding material , a second material which is a thermoplastic polyurethane , on the window - gripping portions of the molding . a conventional adhesive is applied to the window edges , and the second elastomeric material acts as an adhesive promoter compatible with the adhesive .