T&T: Aluminum Fuel Tank Repair Options

[Garrett Davis]

I searched the archives with no luck so now I would like the opinions of the
list.  I have four 88 gal aluminum diesel tanks on my single engine trawler. 
They were installed in 1985 and sit on 1x10 boards spaced out in a pattern to
follow the stringers below.  Moisture got between the tanks and the boards and
now one of them is leaking.  I removed it yesterday to find some significant
corrosion in a few places around the bottom perimeter of the tank where it was
in contact with the wet boards.  I would have to assume that the tank next to
this one has similar corrosion.  Once repaired, they will be reinstalled in a
better manner to reduce further corrosion.  I frankly do not want to go to the
expense of having new tanks fabricated because this is more of a budget boat
and is not the one that I'm going to invest my significant time and money in
for cruising.  What are my best options for repair?  The options I see so far
are:  coat the inside
 with tank coating epoxy,  Fiberglass over the outside bottom and 1/4 up the
sides, try those aluminum brazing rods I see advertised on the net, and have a
weld shop fill the bad spots or have them cut the bottom off and put a new
sheet on the bottom.  I have no idea if it is baffled as there is no
inspection port.  It's pretty light so I doubt there is any baffling.  Please
feel free to elaborate on any repair schemes.
Thanks,

Garrett Davis
1979 37' Sedan Trawler
Sunkyong Marine Ltd
Single Perkins 6.354NA
Guntersville, AL