Cleaning the interior of the tank with muriatic acid may have contributed to
the returning rust. You must completely neutralize muriatic acid, or it
will begin a lifetime project of rusting away whatever steel it has touched.
I once painted a room containing a theater organ blower; the cement surfaces
had to first be scrubbed with muriatic acid. I scrupulously avoided getting
the muriatic acid on metal parts such as conduit, disconnects, etc. Even
after washing these metal surfaces with soap & water, enough of the muriatic
acid *from the fumes* remained to begin the rusting process through enamel
paint, galvanized coatings, etc.
Original message follows:
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I recently redid my fuel tank for my 1960 TR-3A. For the inside, I
blocked off the openings and poured in several rinses of muriatic acid (wear
proper safety protection). After that, I followed up immediately with
several rinses with lacquer thinner. If you rinse with water, you get
immediate rust. After that, I poured in some tank slushing compound that I
got from MOSS.
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