Hi Julie. First off, opinions vary widely on the sealing products used for the inside of fuel tanks... IMHO, a quality product properly applied to a properly prepped surface and allowed to cure the proper amount of time is an excellent way to ensure that your tank will last problem free for the rest of your life. That being said, if one was to buy on the cheap and apply an improperly mixed substandard product to a poorly prepared rusty surface, they are setting themselves up for epic heartbreak and failure... -----Original Message----- From: tcb-bounce@xxxxxxxxxxxxx [mailto:tcb-bounce@xxxxxxxxxxxxx] On Behalf Of Julie Sent: Sunday, September 08, 2013 11:39 AM To: tcb@xxxxxxxxxxxxx Subject: [tcb] Gas tank ?s The Bay gas tank I am putting in Sonne looks pretty good inside but by a couple of guys with perhaps more knowledge than me, they suggested I clean it out with muriatic acid and then I am good to go. But I would bet my mechanic would tell me to prep and etch it and coat it with some POR-15 fuel tank liner paint. That's what I did for my '66 and it worked fine. But maybe that tank was in worse shape? I have heard horror stories about liner paint causing problems if it peels away, so is it too risky? The worst part of my fuel system is my filler tube since it was taken from Sonne's old tank. There is a rusty hue in there even after cleaning. Maybe I should coat just that part? Any advice will be appreciated. Julie