Another shipboard item that works on the road.
For an insidious leak nothing beats 3M 5200 Adsive / Sealant. Very
expensive, but worth every dollar. The UNIFLITE people used it to glue
2 2X4's together to make a 4X4.
A friend had a partly rusted out roof on his van, and a few squirts
of 5200 fared in sealed it up better than original.
I had a '60 Owens 35' carvel planked, with a rotted bow. Used the
git-rot to address the rotten wood, then fit and epoxied new wood to
pretty it up. Had the boat for 13 years, and never saw any more of
that kind of problem. Of course took to washing down with salt water
once a week which I do NOT recommend for you!

Good luck on your project.
Den

http://www.densnet.net