Attaching waterlift muffler to fiberglass hull interior

[Sailor_Grant]

My waterlift muffler was originally installed by fiberglassing it to the interior of the fiberglass hull in the engine compartment. The fiberglass has since come off and now only the pressure of the hoses is holding it in place.

I want to mount it, however, I am not sure the best way to go about it.

I am thinking about gluing a piece of wood to the fiberglass hull, and then screwing it down to that piece of wood.

Would this be a good method? What is the proper way to mount something to the hull interior?

[Bill O]

Re-fiberglass it back in place instead?

[wingless]

As you know there is not much room or access on that boat.

The muffler must be secure. Are there stringers to which the muffler support may be attached?

The water lift mufflers on my boat are screwed to plywood panels screwed to stringers. They are not going anywhere.

[CassidyNZ]

Depends on the waterlift. Many are made of plastic that don’t play nice with adhesives and that could be why yours has come adrift.

But as others have said, before gluing wood into boat as a base, ensure there is enough room not only to fit but also to have access to secure.

I have just replaced both my shower sump assemblies and used my own “custom” wood platforms, glued into the hull, to mount them on. In my view the better method.

[Compass790]

Think that is a fine plan. You can just put webbing or ss sheet straps over it & secure to wood bracket if the muffler doesnt have mounting brackets.
You will have to be very careful to sand & clean with degreaser, the hull where you wish to glue the wood on. Engine room gluing can be problematic with diesel & oil spills saturating the f/glass. You can use 5200 or epoxy to glue the wood on.

[sainted]

If the picture I'm seeing in my head is correct, your muffler was tabbed to the hull, probably with resin saturated mat. Everything is still there, its just that the mat has separated from the hull. If it were me, I'd clean the hull and tabbing with acetone, and inject some thickened epoxy in between the tabbing and the hull, essentially gluing the old tabbing down where it was. Easy.