You can try covering the tube with Gluvit. A flexible marine epoxy.
Bill

wrote in message
oups.com...
Am looking for advice (theories) on fixing pinholes that have developed
in the pontoons of our 24-foot Escapade pontoon boat.
There are several areas involved, probably from electrolitic action.

Our plan of the moment is to drill out each pinhole and pop in an
aluminum rivet that's been dipped first in two-part epoxy.

Are there other good, better, best ways to deal with the problem?