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Unread 19th July 2018, 09:54 PM
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Default removing rust and stopping it from returning.

Not really specific to off-roading or Subarus, but anyone got any tips on removing rust and stopping it from returning?

I've separated the sunroof on the SVX from the frame and it has some(!) surface(!) rust, but is not too bad to rejuvenate.

When cleaning it off, how far do I need to go? do these rust converter products work well enough, thut I can just brush off the most of it then coat?

Is a rust inhibiting / 2 in 1 paint any better/worse than dedicated primer & paint?

Should I be asking these questions somewhere else?!
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Unread 20th July 2018, 01:16 AM
Beachworm Beachworm is offline
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In my experience of restoring old cars I have found that the only sure way to remove rust and prevent it returning in the long run is to remove any rusted panels and replace them with new ones.

In your case, seeing it's the roof panel and given the age of the SVX that would not be a practical solution. If the metal is generally sound and the rust is superficial, sand it back to bright metal and coat with primer and sealer immediately.

If the rust is more entrenched but there are no holes evident after the flakes have been chipped away, and you do not want to go to the trouble of cutting out the affected areas and welding in new metal, you can get a reasonable result using any of the products that are based on phosphoric acid. This reacts with the iron oxide and produces a non-rusting compound. In some cases you will find they contain a PVA solution that forms a protective, sealing coat that you can prime straight over.
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Unread 20th July 2018, 04:16 AM
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Ah, the joys of living in humid, salty air. Maybe move to Tennant Creek? ��
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Unread 20th July 2018, 04:44 AM
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But something about welding is you overheat that area around and later it want to rust mainly on that welding. And you cant do anything underneath panel when you welded new on top.
Those rust converters or paints on rust can help some somewhere is not visiable. I think mostly you cant do much abouy rust in general its just there .done. You can hide it from eyes but to stop it its sometimes just not possible.
Even for small rust lets say you cut that area off and you weld new peace on top. All is fine but guess where first rust will came out.. on weld. Its hard to protect it.
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Unread 20th July 2018, 08:06 AM
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Quote:
Originally Posted by Rally View Post
Ah, the joys of living in humid, salty air. Maybe move to Tennant Creek? ��
Too true. This baby's solid apart from the sunroof.

I don't think I'd ever buy another car with a sunroof though.
Unless it was another svx with a decent sunrood and the rest destroyed.
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Unread 20th July 2018, 08:22 AM
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Quote:
Originally Posted by Beachworm View Post
In my experience of restoring old cars I have found that the only sure way to remove rust and prevent it returning in the long run is to remove any rusted panels and replace them with new ones.

In your case, seeing it's the roof panel and given the age of the SVX that would not be a practical solution. If the metal is generally sound and the rust is superficial, sand it back to bright metal and coat with primer and sealer immediately.

If the rust is more entrenched but there are no holes evident after the flakes have been chipped away, and you do not want to go to the trouble of cutting out the affected areas and welding in new metal, you can get a reasonable result using any of the products that are based on phosphoric acid. This reacts with the iron oxide and produces a non-rusting compound. In some cases you will find they contain a PVA solution that forms a protective, sealing coat that you can prime straight over.
Thanks or the info!

So you've played this game before! One of my clients has just rejuvenated an old ford truck (40's/50s). certainly not restore thoughd, this thing iis about an inch away from being a Hot Rod. pretty cool though.

I've used a phosphoric soution on the sunroof no PVA in it though. fortunately none of the spots on the sunroof are visible once it's re-assembled.

If the replacement frame isn't up to scratch, will be looking around to find some-one good enough to fabricate something. will be expensive, but better than 'welding' in the sunroof with a heap of bog or summat, which is the only other option.
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  #7  
Unread 20th July 2018, 09:22 AM
Beachworm Beachworm is offline
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Apart from all the company lease cars I've had I can't remember one that I didn't fix some kind of rust in. I learned a lot (mainly what not to do) from a friend who owned a panel beating business where I rebuilt a Mazda 323 Turbo that my son wrote off. I did some free work for him to repay the favour and it put me off buying used cars from car yards. Some rust repairs I did to his specifications on a Landcruiser wouldn't have lasted much longer than the warranty.
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