Let the glass be set for 24 hours before you use the car so that the urethane can completely cure; otherwise, performance in an accident could suffer. Before you install the body, roll down the left and right door glass a little so that, if a door is slammed, the cabin is not pressurized. Apply urethane only to surfaces that are not paint or trimmed. To reuse the windshield, remove most of the original sealant from the glass carefully with a razor knife, so as not to scratch the paint around it. Clean off extra old urethane adhesive from the windshield fence, until you have 1 mm remaining. Make sure all support spacers are in good condition and complete. Once your leveled the bead of urethane to roughly 1 mm, add new adhesive backed spacers as necessary. Attach a new rubber seal at the top of the windshield, put the windshield against the fence and spacers and ensure it is level. Use the windshield's marks on the car and fence for orientation, remove it and put it on a surfaced that will not scratch it. Rub the windshield interior with an ammonia cleaner and a clean cloth before spreading the glass prep adhesion promoter evenly around the edge and drying the area. After that, prime the edge of the glass with a 25 mm stripe of primer, wait three minutes for it to dry and check for evenness with a flashlight. Re-priming anything that is uneven. After cleaning the fence with an ammonia cleaner, put on pinch weld primer, making it 15 mm wide and let it dry, checking for even coverage. Hold a triangular adhesive nozzle about 6 mm away from the edge of the glass and place a 10 mm long bead in the center at the bottom of the glass, pulling the ends down flat as you go. Guide the windshield over the cutout, adjusting it to line up with the dots and slowly set it down gently so the spacers are contacted. Put the cowl grill, rear view mirror and rain sensor module onto the windshield as your final step.