Follow up on removing pour in gas tank liner

[30 Tudor]

I've been told several times that sealing the tank should be done.
Mine has some old seepage around the column bracket.

I am assuming that this is something that would have to be done exactly right or the problem being encountered here would be expected. If something can be done wrong some one will do it.

Is it never done succesfully? What is to be done for seeping at seams or at the steering bracket.
I'm all ears.