Tank coating solution?

About 1-2 years ago, in the gear section of the magazine, they mentioned a certain brand of gas tank coating that apparently worked well, sealing in surface rust and not breaking down with age.

I bought a "new" tank for my bike and it sat in the garage while I decided to repaint (or not), ending up with a fine surface layer of rust.

Any suggestions for a good, "permanent" tank coating would be appreciated.  

If it's only light surface rust on th inside of the tank, it can be removed with a 50/50 solution of muriatic acid and water. This stuff is VERY caustic, so remember to use safety goggles and rubber gloves. After using the acid, you must rinse the tank THOROUGHLY with a solution containing baking soda (to neutralise the acid). Rinse again, thoroughly with hot water with a little soap (to help remove any baking soda residue) then rinse well with fresh water. The final rinse should be done with 1 quart of straight rubbing alcohol, or 2-3 bottles of gas line anti-freeze. This will mix with any remaining water and promote quick evaporation. Let the tank air dry, then check the inside with a flashlight to make sure it is clean. If there is ANY white, powdery residue left, more rinses with soapy water/fresh water/alcohol will be needed. If it has heavy rust and/or holes, see if your local dealer can order a Creame brand gas tank resealing kit. Take your time and follow the instructions & you should have excellent results! Good luck!  

I've used the POR-15 tank system in the vintage bikes I build with good luck.  Follow the directions and it works.
Greg