Hood shaking possible fix?

[MARK4A3]

I do notice the rear of the hood shake with bumps on the road.

Do you think it could be fixed by spraying insulation foam between the support structure and the body panel of the hood?

I would love to know if people have already done this and what brand/type of foam would resist heat the best.

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[Dead Horse]

Introducing a moisture barrier into a closed space sounds like a terrible idea.