I used clear silicone, house window caulk. It stays soft and you can remove it later if you want. I put my sheilds on with this and have had them off a couple times since. When I used to race stock cars we would use this for intake gaskets pan gaskets and even header gaskets. Very cheap and good stuff. And never had a gasket problem because of it. Plus it comes in a big tube you can just leave in your caulking gun.
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Steve
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Steve