*hotgunn

Durability of the sealant depends on lots of factors like weather, proper maintenance, etc. We suggest washing with car shampoo. Just dilute the shampoo. You can also wax the car using carnauba wax. Don't use cleaner wax since it will strip off the sealant.

Regarding the stain in your trunk, it might be some unbuffed leftover sealant. Could you possibly bring your car back to us and I'll have it checked.