Airboats are not something I have real experience with, but your one comment got my attention: SuperGlue, or CA, an abbreviation, as it is commonly referred to.
It does not withstand constant exposure to water. it is not waterproof
. Now there is likely to be a storm of comments against this, but this is based upon experience over 20 years.
CA is great and I do use it for some applications on my boats. However if it's below the waterline
make certain to adequately sealed or properly paint
ed over it.
This is a good rule for most glues that sit below the water, with the exception of truely waterproof
glues like epoxy
Good luck with your projects. Cheers Joe