Tank Sealer

When I came back from Mopars at the Battleship in Mobil, my fuel tank was leaking. I had this tank out and had it cleaned at a radiator shop last year when I modified it to install my fuel pump. This thing was clean when I took it off. No rust at all. Now it has what looks like galvanic rust in a few places. It apparently is bad enough that it has a pin hole. I did some research and came up with a product called Dragon's Blood. I'm going to try this because I don't want to have to fab a new tank. Has anyone tried this before?
easyrider