Sealant exhaust duct to hull

[Ospreyfe55]

I am in the process of fixing up a 97’ Yamaha Wave Venture 760, I noticed that the rubber seal that goes between the hull and exhaust duct was shot and it looks like the PO used RTV to help seal it up but failed. I can get a 1/8” rubber sheet on Amazon to cut a new gasket but I was wondering if there was a sealant that would hold up to the heat ( not sure how hot) to seal it up? Should I look at maybe 5200FC or use the rubber sheet to seal it up? Does anyone have any recommendations on a fix or solution?

Nitrile Rubber Sheet (NBR) Heavy Duty, Oil Resistant, Hardness Shore A60 Black Smooth, 12x12-Inch 1/8" W (+/- 5%) for Plumbing, Gaskets DIY Material,Supports, Leveling, Sealing, Protection, Abrasion, https://www.amazon.com/dp/B076VHLCP...abc_7RMBD8G23368915KPMJ5?_encoding=UTF8&psc=1

 

[Ospreyfe55]

I am in the process of fixing up a 97’ Yamaha Wave Venture 760, I noticed that the rubber seal that goes between the hull and exhaust duct was shot and it looks like the PO used RTV to help seal it up but failed. I can get a 1/8” rubber sheet on Amazon to cut a new gasket but I was wondering if there was a sealant that would hold up to the heat ( not sure how hot) to seal it up? Should I look at maybe 5200FC or use the rubber sheet to seal it up? Does anyone have any recommendations on a fix or solution?

Nitrile Rubber Sheet (NBR) Heavy Duty, Oil Resistant, Hardness Shore A60 Black Smooth, 12x12-Inch 1/8" W (+/- 5%) for Plumbing, Gaskets DIY Material,Supports, Leveling, Sealing, Protection, Abrasion, https://www.amazon.com/dp/B076VHLCP...abc_7RMBD8G23368915KPMJ5?_encoding=UTF8&psc=1

Or maybe 3m 4200 or BoatLife Life-Calk?

 

[X2Kid]

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