It most likely had Dicor self-leveling sealant on the roof seams and Dicor no-sag sealant on the doors and windows. Dicor gets firm but not hard. It will also shrink with age leaving gaps. The manuals for most RV's state to inspect all seams at least twice a season and repair as needed.
Most experienced RV'ers will use Eternabond tape on the roof seams. The stuff works great. As far as I know it doesn't shrink.
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Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, Seasonal since 2000.
Car Shredder Op/Tech, Scrap Metal Recycling - retired
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