i have never seen any blistering or excessive rusting on the current Fabers and I have looked at thousands. Scratches, yes; anything to worry about, no. Faber's current paint process is exceptionally effective.
Yes, paint technology has soared in quality across all fields. Now, epoxy technology has taken over.
It's by default DTM (direct to metal) with the highest adhesive factor on all metals (except gold).
Think of octopus "tentacles" that microscopically reach into every crevasse and lock in. These tentacles are incredibly strong too with unsurpassed tensile strength.
The epoxy resins they use are water proof, oxygen proof, and combined with zinc dust to make the body of the primer not only does epoxy have an extremely fine, tight, and extremely strong molecular structure, you add in zinc dust and you have a sacrificial metal added. It's a win win all around. And not only that it's repairable with a LKQ material, unlike HDG which is a process that you can't duplicate at home.
The top color coat is just for coloration, the primer is actually all of your rust protection. The top coat also covers the primer for UV resistance since bare epoxy has very little UV resistance on its own.
But if you use a true Aliphatic linear polyester urethane topcoat such as a 1:1 marine paint like Awl Grip, that is about the toughest topcoat known and will last for decades.
This is all great to hear in the event I ever need to purchase new steel tanks. For now I have 6 HDG HP100s and that is all that I need, but you never know what the future holds.