Chase Tubes

[Seabass]

Im getting ready to install 3” chase tubes through the bulkheads. Other than location through neutral axis of the stringers, any other considerations I should be aware of? How do I secure in the holes - caulking, epoxy, buoyancy foam, nothing? What about terminating at the deck? How are you guys making these connections? I dont see a special watertight flange that can be used. Should I be concerned with buckling if secured too tightly at bulkhead locations?

[OlivierP]

Not an expert, but as no one else answered, for my C17 I glued the chase tubes through bulkheads with epoxy putty, the most important is to sand the tubes to make the surface very rough and improve the bonding. For the through-deck joint which is the most critical I played it safe and built a dam around the tubes and filled it with epoxy, overkill but 100% sure no drop of water will ever get through there.

[fallguy1000]

I used Black Mamba FHG as advised by Aripeka Angler and it has not failed. All my epoxy joints failed on pvc, despite rough sanding..

[Aripeka Angler]

You can glue owl poop to hot butter with black mamba and it will hold.

[cvincent]

Thanks for the information. I will pick some up for my build.