Greg, That's the stuff. Works very well as long as surface it's applied to is clean. Bare metal or epoxy primered cleaned with MEK. I'm building a Murphy Elite kitplane which has wet wing tanks. Just seal the ribs to the spars and skins to the ribs with ProSeal prior to riveting and you get a no leak fuel tank. The rivets are also dipped in the stuff prior to installing them. I don't see why it wouldn't work from the outside if you cleaned the tank surface properly first. It will fill small gaps and still seal after it has cured. Messy, smelly, expensive stuff but it works. I got mine from Aircraft Spruce. Ed E. N214 415D
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