You could certainly prolong its life for a bit with the right repair panels but TBH I would just find a good 2nd hand one/new one and fit that instead, By the time you add in the cost of repair panels you might as well get a whole new one, I paid £50 for mine, got it blasted for £10 then just painted it myself, tipped it upside down and filled it with waxoyl! If I could turn back time I would have got it galvanised...
Mike