14. Clean and lightly scuff the application surface of the louver, and follow sealer’s directions for proper preparation of louver surface with the correct adhesion promoter – this is critical in achieving a satisfactory bond. When using 3MFast Weld Urethane, the proper adhesion promoter is 3M Single step, P/N 08682, available separately – this can also be used to touch-up scratches on the pinch-weld if required.
15. Apply the urethane sealer to the prepared and cleaned area where the original seal was on the car’s body, not the louver. Cutting an inverted “V” rather than straight across into the applicator tip may assist in producing a thin, tall bead with an even height. Apply enough so that the louver will sit flush to slightly recessed when installed. A small excess is acceptable as the louver can be pressed in slightly more, while too little adhesive will cause the piece to sit too far below the surface of the body. One tube is enough to do both louvers. The louvers are different, and are side specific, so be sure to install them in the correct orientation. The louvers point into the interior of the car (hence flush-mount). Follow the instructions of the seal supplier as to set-up times, and install the louvers. There should be approximately a.110” gap between the bottom of the louver and the body line when installed. A small soft shim or some tape may be required to help hold the louver in place as the seal dries depending upon weather conditions. Do NOT close doors with the windows in the up position or drive car until the seal has had time to cure. Failure to follow all instructions of seal manufacturer may result in seal failure or loss of louver!
16. After sufficient time has passed for drying (6-8 hours normally), a final check should be made for water sealing and no wind noise. Any abnormal amount of wind noise should be considered as a possible source of water entry, and should be checked to insure water cannot enter the inside of the vehicle. If water does leak into the vehicle, the louver should be removed, and re-installed to insure a proper seal. A properly installed louver will not leak, and has the exact same contours as OEM glass on both the sealing edge and the outer edge (frame) surfaces.