Re: Rust removal for fuel tanks (any metal, actually): 2 techniques, with links.

Posted by shinyribs on Jun 04, 2013; 3:56am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Rust-removal-for-fuel-tanks-any-metal-actually-2-techniques-with-links-tp4041695p4041737.html

Electrolysis rust removal works great. I've done it several times with auto parts that had hard to get at areas. Riveted together hinges,for example,that can't be bought but also can be separated very easily. I never found that the solution evaporated all that much,but usually it would get a build up of scum on top that will bubble up and sometimes overflow the container I was using. When mixing the sodium bicarbonate(washing soda-nut baking soda works just as well IMO) I just stir in as much as the amount of water will absorb. Any excess will just settle to the bottom and won't hurt anything.  

I say all that to say this: IF you are gonna do the inside of a gas tank,and you like the paint on that tank, cover the outside of the tank to protect it from gunk overflow.

A layer of easy to remove painters masking tape under a good layer of duct tape is the preferred method from what I've read. If you use the duct tape directly on the tank you might not get it off with good results.

Something else I've seen others have good results with,but no personal experience myself,is using straight vinegar. I can't see how it would work,but I've seen a couple times where it has really cleaned out a tank inside. No electrolysis,just pour in straight vinegar and let soak. Rinse out after with a baking soda/water rinse to neutralize the vinegar.