[cleszkie]

Use 3M Black Weatherstripping Adhesive. Apply it to both mating surfaces (rubber and fiberglass) and allow it to get really tacky/almost dry to the touch. Then it will grab really good. I suggest test fitting the rubber before using any adhesive so you know exactly where it needs to be located. Also, be very careful not to stretch the rubber as you are installing it. This will lead to the rubber being way out of position, and appearing to be too long when you are left with several inches of extra length.