Cummins 6BT5.9M exhaust riser expected life

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They recommended to wet it out before installing it so I did, keeps the dust down. I don’t remember exactly how much I used but I think it was like 2 layers thick. Then used the S/S tye wraps to secure it. I didn’t cover it with anything and it seemed fine for the 6 years we owned that boat.
 
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