How to repair houseboat pontoons that leak?

How do we repair houseboat pontoons that leak?

Can we repair a pontoon houseboat that leaks water into the round steel pontoons?

What I mean is, other than welding every little hole that leaks, can we maybe fill them up one of those "expanding foams" used to seal around windows etc...

The foam could expand and fill the pontoon interior, and even if it leaked a little, and took in a gallon or two of water, no big deal, there would still be a lot of buoyancy?

What do you folks think? Am I "out to lunch" and dreaming.

Looking forward to your replies, Mike.




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