I've read others have used it on their roof but if you suspect a leaky seam and can reproduce the leak by running water on the seam I'd duct tape the seam, run water and if the leak doesn't appear then pull about 6" of tape off and apply water. If the leak appears after exposing the last rivets then you can concentrate on sealing or replacing those rivets then retest.
Kelvin
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2008 Classic 25fb "Silver Mistress"
2015 Ram 2500 6.7L Cummins. Crew Cab, 4x4, Silver
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