Is fish oil better than rust converter/primer for treating rust

Found rust on back tray of troopie when lifted floor covering. It seems surface. I treated it with rust converter, then thought I'd give it another go. When I resanded it, found more brown rust under the black surface. I was going to re prime it, just to be sure, to be sure, but am wondering how effective the converter is. Does it just convert the top layer to a black surface and leave rust underneath? Is this effective enough or would I be better just fish oiling the metal when I now resand it?
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Reply By: Member - Olcoolone (S.A) - Saturday, Feb 02, 2008 at 12:24

Saturday, Feb 02, 2008 at 12:24
Fish oil is a preventive cure and stops rust forming in the first place, it will not fix already rust metal.

Rust converter converts rust into iron oxide that stops further rust forming but you still have to seal the metal as the ajoining metal around the treated aera will start to rust.

Primer will not usally seal the metal and rust will form under the primer.

Most rust converters can be painted over.

Metal can rust at differant rates due to the composit of the metal itself.

Regards Richard
AnswerID: 285102

Reply By: Member - Davoe (Yalgoo) - Saturday, Feb 02, 2008 at 13:00

Saturday, Feb 02, 2008 at 13:00
Use the lot buuuut rust WILL always come back I fixed up rust on my camper using firstly rust converter then fish oil than primer then killrust paint then paint. Did a pretty good job but i had to touch it back up with a bit more removal a few years later
AnswerID: 285112

Reply By: Member - joc45 (WA) - Saturday, Feb 02, 2008 at 13:09

Saturday, Feb 02, 2008 at 13:09
I once owned an Italian sports car, which, if you were quiet, you could hear it rusting. There were pockets like door skins and boot lid, where you couldn't get in with rust killer and scraper. I sprayed fish oil in, allowed it to seep right into the seams and the rust, and it seemed to stop the rust in its tracks. (I owned the car for over 30 years).
If you have accessible surface rust, then sanding back and treating first with rust converter, then with a proper rust-proofing primer; eg, zinc-rich, it is better.
Gerry
AnswerID: 285113

Follow Up By: Member - Reiner G (QLD) 4124 - Saturday, Feb 02, 2008 at 14:29

Saturday, Feb 02, 2008 at 14:29
My guess would be Alfa Romeo.....hehe.... I had one of them and it rusted quicker than the tyres wore.
I had a 1750GTV back in the 70's but not for long.

Reiner
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Follow Up By: Member - joc45 (WA) - Saturday, Feb 02, 2008 at 18:02

Saturday, Feb 02, 2008 at 18:02
LOL!
Actually, a '70 Fiat 124 sports, had it since new. Great little car, pity about the rust. Only got rid of it about 3 years ago.
In about 72, I astounded the Vic Landrover Owner's Club when I drove it down into Talbotville site near Dargo when there was only a goat track there.
Gerry
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Reply By: Geepeem - Saturday, Feb 02, 2008 at 13:25

Saturday, Feb 02, 2008 at 13:25
HI Loris,

Consider using PENETROL.
It penetrates rust spots and also is a conditioner.
Drys hard and glossy - can add more to final paint for extra protection.
I have used fish oil but find it always stays tacky - and thus gathers dirt and grime.
I started using penetrol a few years ago and found it the best.
Cheers,
Glen
AnswerID: 285117

Follow Up By: Member - loris G (NSW) - Sunday, Feb 03, 2008 at 00:07

Sunday, Feb 03, 2008 at 00:07
Glen, thanks for tip. I'm tracking it down. I'm assuming it won't matter if it goes over a bit of previous attempt rust converter.
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Follow Up By: Member - Oldplodder (QLD) - Sunday, Feb 03, 2008 at 21:21

Sunday, Feb 03, 2008 at 21:21
2nd that for penetrol.

Think Bunnings have it
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Reply By: F4Phantom - Saturday, Feb 02, 2008 at 15:56

Saturday, Feb 02, 2008 at 15:56
i once sanded a car, used converter, then kill rust, it came through again within months. killrust is a worthless product, its just paint! So anyway I got onto penetrol called the manufacturer and used it, it is the most effective product i have seen. So I did a test 2 yrs ago. I have an old boat trailer, the rust is flaking right through the metal, you know when the metal completly thickens up, its the worst kind of rust. I did no prep and just painted it right on and thats it. 2 yrs later in full weather i cant see any rust coming through. So now all I do is paint on penetrol and then top coat with anything and thats it. BTW dont use the clear penetrol use the aluminium one, it has microscopic flakes of aluminium and layers the metal with it. There is a similar product called ormonds silver shield and now because this stuff is so good I have noticed dulux has followed with one.
AnswerID: 285140

Follow Up By: F4Phantom - Saturday, Feb 02, 2008 at 16:14

Saturday, Feb 02, 2008 at 16:14
http://www.floodaustralia.net/products/penetrol_aluminum.htm
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Follow Up By: Member - loris G (NSW) - Sunday, Feb 03, 2008 at 00:11

Sunday, Feb 03, 2008 at 00:11
Thanks for web site - I've read it and located shop. Sounds like a good deal. A bloke in the motor industry told me that didn't recognise any paint as being effective, but this seems fine. Seems I have used some of their other products - making paint stick to old walls.
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Follow Up By: Geepeem - Sunday, Feb 03, 2008 at 13:35

Sunday, Feb 03, 2008 at 13:35
Yes, Loris it should go over any existing surface OK.
It should be readily available at most Hardware or Paint shops.
I know Bunnings stock it if you have one near you,
Cheers,
Glen
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Follow Up By: Member - loris G (NSW) - Sunday, Feb 03, 2008 at 20:54

Sunday, Feb 03, 2008 at 20:54
Glen,

Oddly, I started out at Bunnings but was assured they had nothing for rust proofing cars and that I should go to Auto One or Repco. Which I did and ended up with the converter.
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FollowupID: 550294

Reply By: pop2jocem - Saturday, Feb 02, 2008 at 18:18

Saturday, Feb 02, 2008 at 18:18
loris G

I have used a product called Firtan, its a rust convertor. Remove flaking or powdery rust, dont clean back to original metal, coat with this stuff as per the directions. I have used this product and have been quite happy with the results. Yes it can then be painted over. No I dont sell it.

Cheers Pop
AnswerID: 285168

Reply By: Member - Mike DID - Saturday, Feb 02, 2008 at 23:30

Saturday, Feb 02, 2008 at 23:30
Our gutters are under a tree and they always have water standing in them for ages after rain.

When I found that the zinc had disappeared there and the rust had started I
1. wire brushed the rust off
2. painted with zinc/cold galvanising paint
3. painted with bituminous paint.

Ten years later that gutter is still rust-free - I can't aske for better rusting-resistance than that in a very wet area.
AnswerID: 285232

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