Rust prevention... am I being bloody stupid?

[RustyNuts]

Hi gang!

 

There is this pain in the arse safrane sat outside that has been slowly rusting away due to health problems hanging over my life for a number of years. Just the last year and this year i've actually been able to crack on with getting the thing back towards roadworthiness (that is when i'm allowed, not being threatened with homelessness or she's simply buggered off for the day and has no idea i've been pampering it).

 

So.. last year I wire brushed all the shocks, hubs, wishbones etc (with the drill and grinder - not a hand brush) to remove the rust. I then reprayed the shocks with Zinc182 rust inhibiting primer (3 coats each) before spraying matt black.

 

The front and rear subframes got the heavy duty treatment with red oxide covered over with hammerite. The hubs (due to time getting short) only got the hammerite treatment from what I can remember.

 

Now the hammerite only parts.. rust is coming back up through them again - despite two or three coats. The shocks also have rust coming back through again.

 

The sub frames from what I can see, are not as bad and seem to be holding out pretty well and the only part I actually used underseal on (that stuff really stinks) seems to have no evidence of any activity at all. The only reason I've not used more underseat (eg subframes) is because it's carcinogenic and stinks to high heaven - stink meaning that the particles are in the air rather strongly.

 

So.. zinc182 doesn't seem to work. Halfords own anti rust primer don't seem to work, red oxide seems to slow it down quite a lot, hammerite seems bloody useless.... 

 

What am I doing wrong here?

[Split_Pin]

I hear that Bilt Hamber rust killer is very good. Might be worth a shot before Hammerite again.

[chodweaver]

+1 for red oxide slowing it down a bit, but the colour of it and rust is so similar, I think it's more 'the appearance of not rusting' than not actually rusting.

 

+1 for Hammerite being useless too, both in the matter of rust prevention and that of being physically tough. It's neither in my experience, just an expensive way of embarrassing yourself.

 

And underseal, as has been mentioned elsewhere, is brilliant for sealing in uncured rust and nurturing it to the point where the bottom of yer car falls off after a period of apparent rust remission.

 

Kurust however I can vouch for - even when I've used it to arrest galloping frillyness in small areas, but put no other treatment on afterwards, it's managed to stop rust from reoccurring for between a year and 18 months, so it's first in my chemical arsenal after the wire brush/flap sander/file/grinder/craft knife have been applied. But at the moment, I'm watching the other threads with mention of rust fighting for clues as to better follow up treatments. My use of Zinc 182 shows it to be ok, but I've not done any proper trials with it and there's much love for POR-15 both here and on other forums for models that are keen to dissolve.

 

And lastly, I can attest that nothing promotes rust like a bit of mig-tickling that's left open to the elements afterwards for even the shortest period. Just don't do it. 

[sierraman]

Hammerite is good for iron railings etc. You want something that'd slightly flexible that resists chipping. I'd use underbody shutz here.

[steveo3002]

bad choice of products ...hammerite is rubbish and red oxide is now all the lead has been taken out 

 

i use epoxy primer...get a big tin of jotun jotamastic for not too much , and it works very well if you bother to derust the parts fairly well

[MikeKnight]

I've found the absolute best things are Eastwood products from Frost.co.uk (sorry about the touting, I don't work for them!). They're expensive but I've not found anything else that beats them.

 

Their Rust Encapsulator is awesome, it's a primer that's basically spray-on rubber mixed with powerful rust killer, you spray that on and overcoat it with their super tough chassis paint. Pop traditional underseal on top of that, and yearly waxoil on top of that, and never see rust again.

[Skizzer]

I'm sure I read a whole thread on here the other day (an old one) about how fantastic Vactan is for painting on to rust and not getting any more rust.

 

Edit: Aye, here you go: http://autoshite.com/topic/16573-vactan-talk-to-me/

[Royale80]

I did the suspension on my car-I used a wire wheel to get rid of the rust then two coats of bilt hamber hydrate 80. Followed this with two coats of epoxy primer (painted on) and then finished off with a couple of coats of black gloss paint.

 

I'm a firm believer in epoxy primer-used it in various places and it definitely repels further rust.

 

Seems to have done the job!

 

Steve

[purplebargeken]

B&H products. Just ace.