Adenauer gas tank sealer.

[dseretakis]

Hi. My 1958 300d has a rusty gas tank. I'm planning on removing it, letting it sit in muriatic acid for a few days, then using the POR-15 gas tank sealer system. Does anyone have any advice, or would anyone do it differently?

I'm also wondering why it's even necessary to coat it once it's de-rusted. When new, these tanks were not sealed on the inside.  The only thing I can think of is that the rust has thinned the metal making it more prone to perforation should some rust start again. What do you all think?

[mdsalemi]

Surely the tank was galvanized on the inside, otherwise it would have rusted in a heartbeat--days, not decades!  Maybe I'm wrong though--best to ask the Adenaeur experts at MBCA.

But once rust starts anywhere the surface coating--be it galvanizing, chrome, zinc or other plating or coating is compromised.  A refinish is almost a requirement, I would think--unless you want to battle the problem forever.

[dseretakis]

But we're they really galvanized? When I peered into my pagoda tank some years ago it was bright shiny metal. It didn't appear to have the grayish galvanic coating. Then again I was peering through gas in a small dark hole so who knows!

[GGR]

I had the tank of my Coupe dipped into an acid bath and I then use the POR 15 sealant inside and the paint outside. I did this 3 years ago and so far so good.