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After you do the Bubble Test with low air pressure in the tanks, heres how
to find the pinholes that will leak with fuel but not air.  Fuel has lower
surface tension than air and will pass thru a void that air won't.
  
Use about 10 gal of VM&P Naptha which can be purchased at Home Depot.  This
is a clear, single component, relatively volatile and HIGHLY FLAMABLE
solvent that will not hurt anything that fuel will not attack.  The
advantage is it will pass thru voids just like fuel but will not leave
residue that could prevent bonding of your favorite sealer.  If (when) you
find a leak, drain the VM&P, leave all the tank vents open and leave the
wing in the sun for a couple of days to vaporize the VM&P that is in the
void.  It takes more time and a few more $$, but hay, this is to save some
real grief down the road.

Steve Colwell
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