I used flex-seal on the roof of my old class A on the front roof seam. It lasted three months and then flaked/peeled off. Not recommended.
In an emergency eternabond will seal a cracked holding tank or shower pan or water tank or skylight or roof leak. I always carry a roll of 4" just in case.
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2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
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