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PostPosted: Wed Dec 21, 2016 12:45 am 
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Location: Ontario, Canada
So I've removed the platform from the chassis, and I'm hoping to repair some rusty spots, holes and dents before painting it in the spring. I figured I'd ask you guys about your experiences with this before I start something that turns out to be impossible.

Rear footwells: Is it possible to remove the rear footwells for repair (cutting and welding new metal) and put them back in? If so, has anyone done that and was satisfied with the process and result? I could probably do most of it without taking the boxes out, but there's substantial rust where they are spot-welded to the platform.
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Rust between panels underneath platform: Can I even do anything about this??
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PostPosted: Wed Dec 21, 2016 1:34 pm 
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Location: Lewes, East Sussex - UK
Drill out the spotwelds, peel out the footwell boxes, cut out rust and weld in new.

Buy a big blow up paddling pool and put platform in it. Fill with water and citric acid (used in cooking and can be bought as powder in various weights), leave platform to soak until all rust is removed. Take out, and rinse platform before drying.
Once dry, apply Galvanising paint and then prime / top coat!

John

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PostPosted: Wed Dec 21, 2016 2:51 pm 
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Location: Ontario, Canada
I've thought of getting the whole thing acid-stripped/derusted, but most of the original primer is still good, and I don't want to take off whatever primer there may be between panels and in all the inaccessible gaps, since I won't be able to paint areas like the inside of the tubular platform rails.

Maybe I can just spot-treat with acid instead of bathing the entire thing? Or is bathing the entire thing the right way to go?


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PostPosted: Wed Dec 21, 2016 3:10 pm 
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Location: Lewes, East Sussex - UK
Citric acid mix will only eat the rust, it doesn't affect the paint unless you leave it a very long time immersed. Acid mix will obviously get in to all the crevices and remove the rust. You then have to figure out a way to protect those nice clean bits of metal- that why car manufacturers dip their chassis rather than just spray paint them.

When you consider the vehicles rusty-ness after 40 odd year, if you remove the rust now you should get at least another 20 years out of it !
John

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PostPosted: Wed Dec 21, 2016 3:12 pm 
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Location: Lewes, East Sussex - UK
Drill holes in the sealed chassis members, remove rust as above, fill chassis members with chassis wax. Put rubber bung in hole to seal it back up!

John

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PostPosted: Fri Dec 23, 2016 9:28 pm 
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Location: Ontario, Canada
I would not acid dip
If you don't neutralize every last spec of it, it will keep eating away at your car and manic holes will appear in perfect metal.
This happened to me and my rear skid plate.
Had it acid dipped, some got inside pipes and it could not be neutralized, and holes started showing up where there was no rust.
Also, the way many place 'neutralize' is a fresh water rinse... which then just causes flash rust!
Real pain!

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PostPosted: Sat Dec 24, 2016 6:51 am 
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Location: Lewes, East Sussex - UK
Comercial acid dipping uses much more aggressive acid mixes than what I am advocating. I agree if you do not neutralise the acid it will over time act in the same way as rust! Weak acid mix obviously takes longer to remove the rust but would also take longer to damage good metal to the point of destruction. It is the only way to get at the rust in the spot welded joints! Shot blasting, no matter what modes you use will never get everywhere there is rust.
Either way it is a total dismantlement of the vehicle!!! Lots of work.


John

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PostPosted: Sun Dec 25, 2016 5:35 am 
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Another option for rust removal without the use of acid dip (either strong or weak) using electrolytic rust removal. It would require immersion and a lengthy period of time. For a Haflinger tub, a purpose built rectangular tank would be optimal to minimize water volume but a larger inflatable/externally framed swimming pool would also work. For example:

https://www.youtube.com/watch?v=NKZv14-K71g

Hope this helps.

Take care.

Jim Molloy
Waldersee Farm
http://www.northwestmogfest.com


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