Best paint for new gas tank

[Challynger]

Got a new gas tank for my old truck. Non-galvanized. Recommendations for best paint or undercoating for rust prevention?

 

[Docpeanut]

Rhino liner?

 

[beamerstrumpet]

just as good as rhino or Duplicolor and cheaper is Permatex® - Undercoating Permatex® 80072 - Undercoating | O'Reilly Auto Parts
Part # 80072 they also have one that is rubberized. works great. used it on my bug as sound proofing. got it at an Oriely's auto. 5 bucks an change verse 7 or so.