As cars age, certain problems begin to pop up. One problem with older cars is a leaky windshield. The source of the problem is probably an opening in the sealant at some point along the window frame. Windshields in older cars are secured to a metal frame with a silicone sealant. As the sealant ages, it begins to dry and develop cracks, which eventually leads to leaks. Correcting the problem involves finding the source of the leak and applying new sealant to the area.
Clean the windshield with soap, water and a sponge. Allow the windshield to completely dry.
Locate the source of the leak. The source of a water leak is not always obvious. The source of the leak may be several inches away from where the water is actually flowing inside the windshield. Ask a friend to sit inside the car. Spray the windshield with a garden hose. Examine the area on the windshield where water is getting inside. Investigate the seal around the frame. Look for dry, cracked and loose spots.
Clean the leaking area around the source of the leak. Use a putty knife or utility knife to remove loose sealant and other forms of debris .
Clean the area with a cotton swab and paint thinner. This removes the waxy residue around the sealant. You will see a crevice or open groove between trim and the windshield frame.
Apply silicone sealant to the source of the leak. The sealant comes in a tube. Remove the cap and squeeze out the sealant from the bottom of the tube. Fill the entire space between the trim and the windshield frame.
Spray the windshield with a garden hose and examine the repair job.
Things You'll Need
Automotive silicone sealant