Do not attempt this yourself unless you have extensive automotive glass installation experience. The rear window of a convertible is particularly challenging due to its size, shape, and the critical need for a waterproof seal.
Instead of trying to do this yourself, take your Chrysler Sebring convertible to a professional automotive glass replacement shop. They will have the proper adhesive, tools, and expertise to ensure a safe and secure installation. They also usually have access to the correct type of urethane designed for the specific year and model of your Sebring. Using the wrong type can lead to failure.