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  #1  
Old 25-03-2019, 08:54 AM
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Default How to treat surface rust

Hi lads

Some time ago I noticed some surface rust forming on the body under the aux battery and on the chassis.

Seems to be due to a leaking battery in the past. A few weeks ago I hit it with some rust converter, got very busy, and finally this weekend I removed some more stuff for better access, mainly the snorkel piping to get a better look at things.

What is the best way to treat and fix this? I'm far from an expert about treating rust.

See pictures

Thanks!
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Old 25-03-2019, 10:26 PM
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Battery acid can be a pain. I generally neutralise it with a Bi-Carb soda wash. For the rust in general there are plenty of good rust converters. I like one with phosphoric acid, can't remember the brand I use at present but it's green and you can get it a Autobarn for one.

Scrape/sand away the flaky paint around the area. Treat with your chosen rust converter as per their directions. Mask off other areas if necessary and hit the bare metal with an etch primer then paint over it with whatever paint you want, either a chassis type black for the chassis etc and color match or close for the body panels depending on how much effort you want to out in or how fussy you are. Lots of shops around can give you a colour match pressure pack these days. Just follow the directions on the paint you buy.

That's the basic version, then it just escalates from there depending on what you want it to look like.
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Old 26-03-2019, 08:38 AM
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Beauty. Thanks so much festerGU
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Old 26-03-2019, 09:26 PM
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It is hard to beat a hand held sandblaster to clean off rust too. Not very expensive if you already have a compressor. Anything that I need to paint I blast it if I can.
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Old 27-03-2019, 01:17 PM
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That's a great idea. I don't have a compressor but I'll see if I can maybe borrow one
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Old 27-03-2019, 04:53 PM
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Quote:
Originally Posted by putteringpatrol View Post
That's a great idea. I don't have a compressor but I'll see if I can maybe borrow one
Easy enough to make if its just for a one off job like you are doing.

https://youtu.be/qpkdaHxL7nA
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Old 27-03-2019, 08:43 PM
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Looks good for a youtube DIY but very impractical and ineffective in the real world. You can see that in the video. I suppose better than nothing but a wire wheel in a drill or something would be more effective.
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Old 28-03-2019, 01:05 PM
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There are many places a wire wheel just wont touch. I put a rubber hose on the end of the one i made so i coild direct it into the cavity i needed to reach.
Certainly not a professional job but much better thsn nothing
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Old 28-03-2019, 09:16 PM
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Yeah nothings perfect, even more so if you are trying to do it on a car that is not dismantled.
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Old 29-03-2019, 08:20 AM
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Yeah the bit i needed to fix was the air duct cavity under the windscreen that feeds air into the cabin.
I dont have the skill to cut it out and fix it properly as there are 3 panels that were rusted in the seam.
I put a 100mm holesaw though the panel and blasted it with one of those diy sandblasters.
Worked a treat.
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Old 06-04-2019, 02:22 PM
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Bicarb wash, get it very dry, then POR15 on the bits you can see and SW2 on the bits you cant.
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