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Affiliate link for 3M  Black super weather adhesive
This 3M black super weatherstrip adhesive is my go-to trick to keep valve cover gaskets and tube seals from falling off during installation. I use a very thin bead on a clean, dry valve cover, let it set up 15–20 minutes, and it keeps everything where it belongs without causing leaks.
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Pros
- +Helps hold gaskets in place during difficult valve cover installation
- +Flexible and pliable once set, so it doesn’t fight the gasket
Cons
- -Needs clean, dry surfaces and a light application—too much is unnecessary
