What type of adhesive should be used to seal a leaking car sunroof?
2 Answers
Automotive sunroof leaks are generally sealed with silicone sealant. The reasons for sunroof leakage are as follows: 1. Reason one: Small sand particles or dust in the sunroof drainage channel causing blockage. 2. Reason two: The sunroof sealing strip has been "lifted" or displaced. Therefore, it is advisable to regularly clean the sunroof to maintain the cleanliness around the drainage channel. Additionally, during routine car washing, use a high-pressure air blower specifically designed for this purpose to direct air towards the drainage pipes, aiming to blow out any debris inside the pipes. If the sunroof sealing strip of the car has been "lifted" or displaced, this indicates excessive friction between the strip and the roof. In such cases, a small amount of plastic protectant or talcum powder can be sprayed on the sealing strip and related components to reduce unnecessary friction between the strip and the roof while maintaining the sealing effectiveness of the strip.
I recently dealt with a sunroof leak issue and found polyurethane sealant works quite well. First, thoroughly clean the old adhesive and dust from the sunroof gaps using a small brush and alcohol, ensuring it's completely dry. Apply a thin layer of sealant to the leaking area – don't make it too thick or it won't compress properly. Remember to wear old clothes as this sealant is hard to wash off. Keep the sunroof closed during application and wait 24 hours for full curing before water testing. In practice, it's more durable than regular silicone sealant, standing up to sun exposure and rain. However, this is just a temporary solution – if the rubber seal is severely aged/deformed or the drainage channels are blocked, sealant won't help. Try to avoid parking under trees regularly, as leaf debris and silt clogging drain holes are the main causes of leaks.
