Gas Tank Refurbishment

[PbFut]

After 8 months of distractions, I am circling back around to my factory auxiliary fuel tank. I have acquired the parts I think I will need. The tank was badly damaged from a failed filler hose not taken care of, allowing water and dirt from the bed to flow into the tank. The feeder lines were capped off so no issue with contamination into the main system. Cutting an inspection hole, the tank was pretty badly rusted inside, but not so much as to compromise the integrity of the tank. I used a Harbor Freight sand blaster to clean things up as best I could considering I was squirting blind in the tank. It will need a little more work to finish descaling to an acceptable condition. I have searched and found a few tank treatment kits. Can I get any recommendations from those that have used these kits and how scaled was your tank prior to use.