Exhaust tube delaminated

Roseand

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#1
Was wiggling my exhaust tube from inside the hull and noticed daylight shining through. Turns out the epoxy broke. Some was still adhered to the hull and some to the exhaust pipe itself so it's not like the surfaces weren't prepped.

I did hear that if you run your pipe too hot it can soften the epoxy.


My question... What's the best way to go about it? There is no bulkhead so the only area it's supported is the back of hull and the connection point, so it has the potential to have a lot of flex. That makes me not want to use epoxy, also due to the heat factor. Would my best bet be using 5200(or 4200 because 4200 is rated for metal to fiberglass bonding and 5200 isn't?)
I need structure and flexibility I assume..

Any advice is much appreciated. This is after 3 seasons of use.

Here's the open bulkhead style I'm dealing with. Plan on adding a longer metal exhaust tube while I'm at it...

Thanks!

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Big Kahuna

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#3
Errrr, Your Tube did not de-laminate. It broke bond from the hull. I would just use Black 5200 or White. Problem is you are not going to be able to bond from the inside of the hull at the rear so your bond will have be done external. I would build some form of mini bulkhead to support the tube right by where the firewall would be normally to support the tube. The vibration and movement of the motor caused it to "Wiggle Loose". Did you find where we tagged you on the Hazard Bracket yesterday?
 

yamanube

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#6
Definitely add some support, that's crazy to have that just floating there.
 

Roseand

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#7
Okay awesome, I'll add a support. So 5200 is my best option for an adhesive in this case?

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yamanube

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#8
Somebody might say otherwise but I would use thickened epoxy, I would also poke that tube out of the back of the hull slightly and run a bead of thickened epoxy around the outside seam.
 
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#10
If I had to repair that I'd weld a flange or tabs on the end before it protrudes the hull. Then you could drill the flange/tabs and hull and fasten it with rivets or screws from the outside at the same time while applying an adhesive of your choice.
 
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