Airstream used to recommend Sikaflex 221 and Acryl-R for sealants for different applications. You may find specific recommendations in current owner's manuals (they can be accessed online) or contact consumer relations at Airstream and ask them. Vulkem was used long ago and may have been superseded by newer sealants.
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Gene
The Airstream is sold; a 2016 Nash 24M replaced it.
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