The subject invention provides for a weatherstrip assembly for sealing between a frame and a closure member of a vehicle. The assembly includes a trim portion having a body and a flange extending from the body. The flange is capable of moving between an initial position and a final position. A seal extends from the body for abutting and sealing the closure member. An adhesive is disposed on the body for coupling the trim portion to the frame. The adhesive is disposed opposite the seal such that the seal extends away from the adhesive. A retaining member is selectively mounted to the flange and spaced from the adhesive for selectively engaging the frame to selectively hold the flange in the initial position relative to the frame. The retaining member is removed from the flange while concurrently moving the flange toward the final position.