Sure seems loke a good time to use something that would 'wick' into the seams, then cover with Vulkem.
Most times it is so tough to remove, I clean it, and seal above old.
But yours is coming off easy?
Sounds very different from the areas I have found old Vulkem.
Your opinion is valued, please not your opinion of someones else's opinion.
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1989 Airstream 345 Liberator...
1972 Argosy 24'...
1954 Feathercraft Vagabond