Superior construction
Yes, Sudsy, if you have a fiberglass roof, you can rap on it with your knuckles and it should sound the same as the end caps and outer wall skin, a hard surface, no rubber skin over it. They may have done a sloppy job with the sealant (maybe wrong stuff, as well) but at least at this stage you don't have any worries about the rig rotting down around your ears.
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