Gas tank cleaning and sealing

I recently sealed the inside of my fuel tank not for rust just preventive maintenance. I purchased a kit from POR. A great product that cost about $50.00.The kit comes with a cleaner for gum, rust,sludge etc, metal ready etch for any rust, sealer and a bottle of fuel preservative. The tank must be removed from the engine comp, compleatly disassembled and cleaned, this includes all pick-up and return tubes and sending unit. With the tank out of the car cleaned and compleatly dry turn the tank upside down and apply some heat with a industral heat gun(no open flame). That should do it after a couple of times using the penatration oil in between intervals. Apply Teflon tape or sealent on the plug when reinstalling it to prevent future problems. Good luck...

Thanks for your input. Tank is out and so is the drain plug. My car is a 72 and has a banjo fitting atop of the not intended to be removed pick up tube. I am going to have to find a way to cover or block the bottom of the tube prior to sealing. Anyone who has done this?