A caveat re cleaning up the outside of a tank hole... I used a highly touted prep from POR-15 specifically made for gas tanks. When it dried inside, it looked very durable and, yes, did stop all 4 leaks. However, then I went to polish the outside of the tank, and when I re-installed it and filled with petrol, it came squirting out one of the holes. My guess is that there was a little "zit" protruding through to the outside, and when I ran the polisher over, it must have pushed it inside and broken off the sealant, leaving the hole.
Proceed carefully with anything dribbling from the inside out!
Phil Auldridge Austin, Texas - USA
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53 SQ 4 MK II, '72 Norton Commando, '78 BMW R100/7, '79 Honda CBX, 2014 Indian Chief Vintage