Chris Tyler Messages: 458 Registered: September 2013 Location: Odessa FL
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Senior Member
Silicone doesn't hold up well especially on the roof. RTV for gaskets [like permatex ultra black ] will fare better- they are heat resistant
With that, let it set up and then cut the bead to frim to give a more finished appearance
For block sealants I like Vulkem bu tit takes a long time to set