The question of tank coatings comes up frequently on the forums on this board. I've coated three tanks and I've exchanged correspondence with others who have done more than I have.
Like painting, the key to success is the preparation. Properly prepped, the coating will stick and last. The benefit of this is that the coated steel is no longer subject to exposure to moisture and the result of that is no rust particles sloshing in the bottom of your tank to plug fuel filters or be nucleation points for rust-thru pin holes.
I have used products from Kreme (I think they make Eastwood's kits) and I've used the POR-15 tank liner. I have several friends who swear by Red Kote. My preference is for the POR product as it is tough, slightly flexible, uses less dangerous chemicals, and leaves a metallic loaking coating. Kreme goes on white and quickly takes on a redish-amber color from the fuel. With POR your tank always looks new.
Charlie, whatever you decide to do... remind me to respond with caution if you ever invite me to a barbecue.