Welcome tot he forums!
There is a special "caulk" for sealing seams etc on your coach. The two products most widely used are Silkaflex and Vulchem.
This is much preferred over caulk, as caulk is not really designed for sealing metal in a continual flexing condition.
To answer your next question in advance, either product can be purchased direct form Airstream, or a couple of sources here on the forums. A search for "silkaflex" will yield names of vendors, and application methods. A search for "vulkem" will do the same for that product. Good luck with your neww project.
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Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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