By the sound of the description on the 3M Super Weatherstrip Adhesive, makes it sound like it would work well to seal a valve cover.
Adhesive is a strong, flexible, rubbery adhesive that can withstand vibration, oil, grease, and extreme temperature variations. It is an excellent adhesive for holding paper, cork, or rubber gaskets
I know that's not what you intended but it's good to keep in mind.
I thought about sealing my windshield frame like this using silicone. I never fold mine down so I might just seal the heck out of it.
We use silicone on everything at the glass shop. It holds up to a lot of stuff and it's got some give to it so it won't crack or rattle loose.
1986 Jeep CJ7 (
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Remanufactured 258, ARB lockers front & rear, 4.10 Yukon gears, 35x12.5" Super Swamper SSR's, Motorcraft 2100, 4.5" Rubicon Express Extreme-Duty lift, York 210 OBA, Big Daddy steering, Tatton rear CV driveshaft, Herculined interior, TJ flares, lots of body & upholstery work