Rust spot on car paintwork

DorsetDude

DorsetDude

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Keith
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Hi all, have noticed a fairly small 2mm x 6mm ish line of rust on the door sill of my car.
someone said to me to get some of the rust "stuff" you paint on and then you paint the body coloured pain over that.

Is this right? If so what is this rust stuff and do halfords do it?

Grateful for any tips basically.

Cheers
 
I've used Kurust before (sounds like what you're talking about) although I've been told you can't elimimate rust without seriously sanding back or cutting out sections of metal.

Halfords should do Kurust and a touch in kit for your car.
 
Cheers Russ, I always thought that about rust as well.
 
There are various rust killers such as Dinitrol RC800, but if you want it to look like new you have to sand back the rust to good metal underneath, then fill, prime and paint, or if the metal becomes too thin or has holed, cut out a section of metal, weld in new and then go through the paint prep stage.
 
andrewc said:
There are various rust killers such as Dinitrol RC800, but if you want it to look like new you have to sand back the rust to good metal underneath, then fill, prime and paint, or if the metal becomes too thin or has holed, cut out a section of metal, weld in new and then go through the paint prep stage.
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:'(

Thanks andrew.
 
crofter said:
Don't worry about it, mines 50% rust, when it reaches 75% rust it will go to the scrap yard and I'll get one that's only 30% rust.:lol:
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My Dad had a light brown Marina estate when I was a kid, I remember him "touching up" the rust with Hammerite and a 2" brush :lol:
 
crofter said:
Don't worry about it, mines 50% rust, when it reaches 75% rust it will go to the scrap yard and I'll get one that's only 30% rust.:lol:
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when it reaches 75% rust sell it at a premium to the muppets who think rat look is a good thing :lol:
 
Keith, larger Halfords can often mix paint to the code that you'll find on the VIN plate. Good Halfords will also have someone who knows what and where to look for to find said number! The rust stopping stuff does seem to work but doesn't leave a very pretty surface. To get a better finish, try killer, leave to cure and work for a while, sand back to as smooth as possible, retreat, leave to cure then paint. Metallic finishes will usually need a final coat of lacquer to finish the job.
 
Russ77 said:
My Dad had a light brown Marina estate when I was a kid, I remember him "touching up" the rust with Hammerite and a 2" brush :lol:
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The good old days, when sills painted with Hammerite were harbingers of doom on used cars :naughty:
 
crofter said:
Don't worry about it, mines 50% rust, when it reaches 75% rust it will go to the scrap yard and I'll get one that's only 30% rust.:lol:
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:lol: :lol:

Russ77 said:
My Dad had a light brown Marina estate when I was a kid, I remember him "touching up" the rust with Hammerite and a 2" brush :lol:
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Can you remember what colour it was before he started "touching up" the rust? :lol:

onomatopoeia said:
The good old days, when sills painted with Hammerite were harbingers of doom on used cars :naughty:
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I thought the good old days were when everything had rust visible on the bottoms of the door skins and lots of cars had holes in their sills :whistling:
 
Yves Geza said:
I thought the good old days were when everything had rust visible on the bottoms of the door skins and lots of cars had holes in their sills :whistling:
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I had a car like that, a Marina in fact, was my first car. I wouldn't have dreamed of trying to sell it though (not even to a trader as a part exchange). The near side sill was not actually attached to the floor for about 3' back from the front wheelarch, a 1.5" gap would open up on right hand bends :suspect:.

We cut it up with a hacksaw and took it down the tip in bits!
 
You can't kill rust from the outside, you will have to tackle the root cause. Is it a stone chip? Is is a seam or is it worst case rusting from the inside out?

You will have to sand back the area, treat the rust with phosphoric acid and then repaint it.

Alternatively there are sealer paints available like POR15 which when painted over rust will permanently encapsulate it preventing any further oxidation.

Whichever method you need to get the entire rusty bit treated, no point treating the outside if it's rusting from inside as it will just come straight back.

The sure fire method is sand to bare metal, phosphoric acid the rust, wash and repeat, wash, Dry it till it's drier than the Sahara the POR15, guide coat with primer, wet coat primer, sand, then onto the colour coats. That is a permanent repair for surface rust, if you can poke a hole in it then it's new metal time.
 
onomatopoeia said:
The good old days, when sills painted with Hammerite were harbingers of doom on used cars :naughty:
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Yes, that and Underseal painted on the underside. Used to hide a heap of problems and allowed rust to creep everywhere unseen until suddenly the Underseal flaked off.
 
The rust spot is so small that sanding back to bare metal etc is going to make the repair look even worse than the tiny spot it is now. Its only a tiny rectangular spot, maybe 2mm by 6mm or so. Going to be very dfficult to sand back such a small area I think. Although I have got some needle files things so maybe could try having a go at it with a rounded one of them then do the killer then paint and seal.

Cheers all.
 
DorsetDude said:
The rust spot is so small that sanding back to bare metal etc is going to make the repair look even worse than the tiny spot it is now. Its only a tiny rectangular spot, maybe 2mm by 6mm or so. Going to be very dfficult to sand back such a small area I think. Although I have got some needle files things so maybe could try having a go at it with a rounded one of them then do the killer then paint and seal.

Cheers all.
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wet and dry wrapped round a lollipop stick. :thumbs:
 
The thin edge of the stick might just work! Cheers.

Does mean I'll have to go out and buy a lolly though...
 
Ain't life a biatch!!!

TBH, I would probably just treat the spot with the kurrust stuff and if/when I believed the problem was halted, I would stick a drop or 2 of topcoat colour in the chip. I would then keep an eye on the area to make sure there was no recurrence of the spotting and if there was take further, more drastic action.

(However, I would still go out and get a lolly - one or 2 per week should ensure a steady supply of sticks!)
 
Nod said:
Ain't life a biatch!!!

TBH, I would probably just treat the spot with the kurrust stuff and if/when I believed the problem was halted, I would stick a drop or 2 of topcoat colour in the chip. I would then keep an eye on the area to make sure there was no recurrence of the spotting and if there was take further, more drastic action.

(However, I would still go out and get a lolly - one or 2 per week should ensure a steady supply of sticks!)
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Can't argue with any of that!
 
Why not just use a company like ChipsAway? They come out to you and do a lovely job.
 
As others have mentioned, you will not be able to completely eliminate the rust without cutting out the affected area. It WILL come back despite treatment.

For now, just sand back the affected, and surrounding, area and treat with some primer and fresh paint. Apply a wax top coat as well to protect, particularly during the winter.
 
DorsetDude said:
Any idea of costs?
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Sorry I don't. But you're already looking at the thick end of £30 by the time you've bought wet and dry paper, rust preventer, primer & matching paint, so it might be worth having it done by a pukka company. If its metallic paint I would let a pro do it whatever, it's a bitch to get metallics to colour match with the original paint.
 
True. I suspect I'd be looking at £200+ with chips away but might give them a try.

Thanks
 
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Don't necessarily use chipsaway but do use a decent bodyshop. One of the best ones I used looks like a car scrapyard but does great work.
 
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