I doubt that it is glue after 4 years. Is your LP gas detector working? Test it!
If it is, then what you may be smelling is the ducts heating up after none use. The only other thing that comes to mind is that a breeze may be blowing the odor from the ignition cycle back toward the coach.
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2004 Itasca Sunrise 36', Workhorse
2003 Suzuki XL7
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