Whenever I've had to repair those types of cracks, I do not remove the old. I do clean it as well as possible. I scrub it with a brush and some Dawn, rinse, let it dry completely (I give it an over night usually). Then come back next day and follow up with an alcohol cleaning. Then just simply add new on top of the old.
I'm too concerned about damaging the rubber membrane by attempting to remove the old. As long as the old is still sticking good and tight, a new bead along the actual crack, sealing it has always worked well for me. I've done these types of touch-up on all 4 of my campers in the past and never had an issue later.
If the old can be removed, for example, it's flaking or crumbling, then yes, remove as nothing is actually sticking to the rubber. However, if its holding well, leave it. The less you fiddle with some things, the better off you are.
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History is not about the past, it's an explanation of the present.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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