Thanks Terry, I appreciate that.
The process of etching and sealing the tank actually lasted over about 4 days and I could see how if someone thought this might be a 2 hour project, they might be disappointed by the results.
The first round of etching with the phosphoric acid lasted overnight and failed to remove all the rust in the tank. It did though, open more pin holes in the bottom of the tank. So, after cleaning and soldering more pin holes, I went for another overnight etching treatment, this time with a more concentrated solution of acid. After 3 rounds of this process I felt confident that there was no more rust and that all the holes had been plugged.
Thanks again.
