IG, steel-sided pool, What's Procedure to prime & paint ?

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What best procedure to prime & paint ?
This is an ancient pool (40yo - so they don't make 'em like this anymore)... steel-siding, with panels welded together.
I've got some minor rust in the seams, that I want to repair.
I'm familiar with most of the steps ( but may need to make adjustments, if there's suggestion recommendation from expert )
sand or grind down to bare steel.
treat surface ( with ???)
prime ( intending to use the 2 part, Olympic steel primer )
paint ( Olympic epoxy paint )


I seem to remember proper procedure includes some treatment with TSP or Muriatic acid.
I'd also consider caulking in the crack of the seams, but not sure what I'd use, or if this is necessary.

If anyone (old-timers especially, who've been in the biz for a while) has seen/treated this situation, please advise. Thanks in Advance !