displaying posts 1 to 17 of 17

Author Subject: underbody protection
clen666

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Location: Co. Durham

Registered: 12 Feb 2009

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Post #1
Planning to attack the rusty underside of the car, starting with the boot floor.

If I take it back to bare metal, what is the best product to apply first to protect it from further rust, as it may be a while before I get it painted properly?

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Posted 9th Jul 2012 at 14:16
eliotrw

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Location: Southwark

Registered: 18 Jul 2010

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Post #2
I cant remember who (I think it might have been russbez) but someone had a good bit in their project on the subject.

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Posted 9th Jul 2012 at 14:19
mik

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Location: Kent

Registered: 17 Feb 2011

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Post #3
There are a few project threads mentioning the subject, including mine.

Bilt Hamber Electrox zinc primer is what I used and I'm very happy with it.

It can be overcoated with a variety of paints when you are ready, and the zinc provides cathodic rust protection in a similar way to the original galvanising.

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Cherry Rallye SOLD

Posted 9th Jul 2012 at 17:49
prism7guy

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Post #4
When i expose bare metal on mine i tend to paint over it with a bit of bilt hamber hydrate 80.

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Goldie the track car.
Posted 9th Jul 2012 at 17:57
mik

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Location: Kent

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Post #5
A test an owner did comparing results from Hydrate 80 and Electrox. It is an unscientific test from only one person but...

http://www.detailingworld.co.uk/forum/showthread.php?t=211862

Key quote from the link: "For me, the photos clearly show the difference the Electrox Zinc rich primer made, indeed I could only spot some minor decay, but mostly the finish was still pretty much perfect...it appears that the Hydrate 80 does help to a certain extent, but for my requirements, it was clear that I needed to derust the area properly and then use Electrox and then a top coat for longevity".

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Cherry Rallye SOLD

Posted 9th Jul 2012 at 18:17
clen666

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Location: Co. Durham

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Post #6
Any idea whether the electrox pots or aerosols are better?

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Posted 9th Jul 2012 at 19:15
mik

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Location: Kent

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Post #7
Aerosols will give you a better finish as the brush-on stuff will show some brush marks. But under the car it is not really a drama and brushing means you can get it under fuel/brake lines etc without making everything grey, fill the pits nicely etc.

Aerosols better for brake backing discs, the factory airbox, getting inside chassis rail etc.

I've got both and a single 1-litre standard tin has lasted really well - I started at the back of the car and am up to the engine bay and there is still around 1/4 of a can left.

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Cherry Rallye SOLD

Posted 9th Jul 2012 at 22:27
dan86

Senior User

Location: Bideford

Registered: 10 May 2009

Posts: 548

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Post #8
I use a cold zinc galvanising aerosol to cover bare metal. I get it from the local farm supply shop as the farmers use it to cover up any welding they do to galvanised gates. Once dry it leaves a 95% zinc coating!

Then I overpaint as normal with primer then basecoat/lacquer.

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Posted 10th Jul 2012 at 07:03
clen666

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Location: Co. Durham

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Post #9
The area will be completely stripped of brake lines etc. so might just go for the aerosol.
I was unsure how far the aerosol would go but it sounds like it gives decent coverage

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Posted 10th Jul 2012 at 09:20
coskev

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Location: Oswestry

Registered: 01 Nov 2009

Posts: 3,132

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Post #10
Rust bullet is my personal recomendationThumbs up

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Posted 10th Jul 2012 at 17:18
phillipm

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Location: Rotherham

Registered: 15 Oct 2006

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Post #11
BH do decent epoxy mastic for rollering on underneath now too.

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Posted 10th Jul 2012 at 17:32
T400 PUG Banned!

Location: Burnley

Registered: 01 Jan 1970

Posts: 641

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Post #12
ive done mine with a variety of stuff, i went at it with a grinder wheel and then chemicals to get in the pits with bilt hambers stuff as much as possible. some bits of localised deep rust i just used that por 15 stuff on. Other places got zinc electrox stuff. then painted with some paint and sealed with bilt hambers stuff. ive used the bh converter as well which is ok but i prefer to strip it back and electrox it if possible. that paint is really good but i reckon for a pukka job the metal needs sandblasting to get a really good key for what ever paint you use after that.
Posted 11th Jul 2012 at 19:12
clen666

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Post #13
Yeah I have some deox gel to try and treat any rust I can't remove with a disc.
I think I'll try coating with electrox and then possibly coating in the black epoxy mastic.

Is that all that would need to be applied or would you supply another layer of something?
The BH site states " Epoxy Mastic is inert to the vast majority of top coat systems."

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Posted 11th Jul 2012 at 19:32
daver6

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Location: Durham

Registered: 08 Aug 2010

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Post #14
Are you up in consett mate? I'd like to view the results once you've had a go? Smile

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Posted 14th Jul 2012 at 12:20
clen666

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Location: Co. Durham

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Post #15
Yip, but you might be waiting a while if this weather doesn't improve! LOL

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Posted 14th Jul 2012 at 12:43
daver6

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Location: Durham

Registered: 08 Aug 2010

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Post #16
Haha mine'll have rotted away by then

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Posted 14th Jul 2012 at 18:19
daver6

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Location: Durham

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Post #17
Haha mine'll have rotted away by then

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Red Rallye - Rolling "restoration"

Wishbone Polybushes available
Posted 14th Jul 2012 at 18:19

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