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Old 07-02-2005   #1
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help on repairing a small dent please..

Hi all
Can anyone please offer advice on repairing a small dent please?
I'd like to have a go myself and would like any hints & tips,products to use and where to best get a colour match paint.

Thanks a lot
Peter
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Old 07-02-2005   #2
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Re: help on repairing a small dent please..

Quote Originally Posted by peterp
Hi all
Can anyone please offer advice on repairing a small dent please?
I'd like to have a go myself and would like any hints & tips,products to use and where to best get a colour match paint.

Thanks a lot
Peter
It may pull out, is the paint actually broken?? Also is the metal creased, or just pushed in?
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Old 07-02-2005   #3
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Re: help on repairing a small dent please..

Hi Luke
Upon closer inspection there actually is a 1/2" tear through the bodywork.The whole area to for repair is only about 3" square though.
I'm not really looking for any miracles here but merely trying to avoid extortionate garage bills if its possible to do a reasonable job myself.

Cheers
Peter
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Old 08-02-2005   #4
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Re: help on repairing a small dent please..

haynes manual tells you roughly how to do it (any one its not car spercific), but rember the better the preperation the better the job, use filler in thin layers dont try and fill big holes all at once
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Old 08-02-2005   #5
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Re: help on repairing a small dent please..

Quote Originally Posted by dave
haynes manual tells you roughly how to do it (any one its not car spercific), but rember the better the preperation the better the job, use filler in thin layers dont try and fill big holes all at once
If there is a big gap to fill then try using some p38(? could be p40 ) - Fibreglass bridging compound, then use filler in layers to bring it level. Make sure you sand it all down using different grades of paper, the finer the better when you're getting to the level you want. Then a couple of coats of primer, rub it down again with your finest paper (removes any small grit scratches). Final layer of primer then its ready to paint with whatever colour you need.

Halfords do a project pack of sandpaper which should get the job done
AND MAKE SURE YOU USE A SANDING BLOCK!!!! Dont use your hand otherwise it wont be smooth and when you come to paint it, when its dry it will stand out a mile.
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Old 03-03-2005   #6
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Re: help on repairing a small dent please..

I would use aluminium tape first (after treating the bare metal with kurust or something) before adding any sort of fibreglass/filler. If you can access the dent from behind, hammer it out so its only slightly lower than the surrounding bodywork. You may also be able to close the gap on the tear.
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Old 03-03-2005   #7
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Re: help on repairing a small dent please..

Hmmm, doesn't aluminium increase the rate of rusting with steel?
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Old 03-03-2005   #8
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Re: help on repairing a small dent please..

Quote Originally Posted by The Negotiator
Hmmm, doesn't aluminium increase the rate of rusting with steel?
No, I don't think so, as Al will oxidise first thereby protecting the steel. It's like Zinc blocks on ships hulls - the zinc reacts first, protecting the steel. Galvanising is the same. Anyway, Haynes say to use Al tape, so it must be alright.
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Old 03-03-2005   #9
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Re: help on repairing a small dent please..

Besides I said to treat any bare steel with rust killer!
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Old 03-03-2005   #10
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Re: help on repairing a small dent please..

Zinc is different, it does work like that but aluminium doesn't.

It's to do with the magnitude of the negativity of the equation. I honeslty can't remember enough about it to explain properly but trust me, aluminium AFAIK speeds up rusting - it makes electrons more available which are necessary for the oxidisation reactions.

I am going to try and teach myself again about it again when I get chance to explain why.
I was sure I had it on my website but looking where I would expect it to be (http://www.paulharrison.netfirms.com...sion_notes.htm) I don't have it.

Hmmm...
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Old 03-03-2005   #11
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Re: help on repairing a small dent please..

I remember now, it's to do with electropotentials of REDOX reactions. This why zinc works and aluminium doesn't. I will remind myself of the exactly principles when I have time but I am very surprised Haynes would say do that.
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Old 03-03-2005   #12
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Re: help on repairing a small dent please..

For the record I now am persuading myself i am wrong lol
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Old 03-03-2005   #13
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Re: help on repairing a small dent please..

Quote Originally Posted by The Negotiator
Hmmm, doesn't aluminium increase the rate of rusting with steel?
Would make sense, thats why they say yu shouldnt clean aluminium heads with wire wool (Well apart frm the fact that it'll gouge into the Al, it'll leave bits in it!)
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Old 03-03-2005   #14
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Re: help on repairing a small dent please..

Al and Zn have similar electronegativities, and similar oxidiation states.
They would therefore be close to each other in a reactivity series, and would therefore oxidise at similar rates.
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Old 03-03-2005   #15
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Re: help on repairing a small dent please..

OK, I took the easy way out, I know with what I can remember it WILL stop rusting but I just remember something in the back of my head saying "no, aluminium speeds up rusting" - hence my original post. I therefore have emailed my head of sixth form and chemistry teacher, an Oxford graduate....he's a good bloke so will know pretty soon
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