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Rust treatment and painting of metal chassis

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SMoo

Posts : 5
Join date : 2014-08-18

Rust treatment and painting of metal chassis

Post by SMoo on Mon 18 Aug 2014, 10:19 pm

Hi folks,

First time posting here (just bought a 1990 Discovery) so thanks in advance for any help.

On inspecting the dandy when I got it home, I've noticed some rust patches on the the chassis underneath.

I plan to get underneath with a wire brush, give the rust patches a good going over and trea/paint them- I was thinking of using hammerite. Is this advisable, or would anyone recommend using something else?

Thanks!
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Tow Itch
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Posts : 3175
Join date : 2011-06-20
Location : Leigh Gtr Manchester

Re: Rust treatment and painting of metal chassis

Post by Tow Itch on Tue 19 Aug 2014, 9:30 pm

I know the Phoenix(s) used Hammerite on their [You must be registered and logged in to see this link.]
I've no idea at what is best to use on rusted or partially rust removed metal. Not done the underside of a car in years.
Mr P may be a help as currently restoring an MG Magnette.

navver

Posts : 995
Join date : 2013-01-03

Re: Rust treatment and painting of metal chassis

Post by navver on Tue 19 Aug 2014, 10:38 pm

I could do with painting my legs as well. They are a bit rusty around the welds. Not sure on the paint for them either.
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Phoenix
Dandy Expert

Posts : 1435
Join date : 2011-09-07
Location : South Norfolk.

Re: Rust treatment and painting of metal chassis

Post by Phoenix on Wed 20 Aug 2014, 10:52 pm

Hello and   SMoo

When we did our rebuild on Phoenix we did hammerite the chassis as Mr Itch has said. Once we had refitted the floor we also then sprayed the whole underside with Schultz which is an under sealer for cars etc.

If you are just treating a few surface rust areas we would just clean them down with a wire brush, brush paint the area with some hammerite and then paint on some type of brush on under seal once the paint has dried.

The Magnette Mr Itch is referring to is beyond wire brushing and treating, its more cutting out and replacing.  lol! 


Navver

We would be tempted to use Hammerite on those too. Probably the spray on smooth type.
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Tow Itch
Dandy Expert

Posts : 3175
Join date : 2011-06-20
Location : Leigh Gtr Manchester

Re: Rust treatment and painting of metal chassis

Post by Tow Itch on Wed 20 Aug 2014, 11:51 pm

Phoenix wrote:
Navver

We would be tempted to use Hammerite on those too. Probably the spray on smooth type.

Just been to the Hammerite website and I'm surprised Hamerite is not made by the same people who manufacture Ronseal which is famously advertised as "doing exactly what it says on the tin" but where they studiously avoid saying what it does on the tin. Hammerite obviously extend this to there  website you can't use Hammerite on galvanised surfaces, now I think the legs are zinc pacified what does the Hammerite site say about other zinc coatings??????
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Phoenix
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Join date : 2011-09-07
Location : South Norfolk.

Re: Rust treatment and painting of metal chassis

Post by Phoenix on Thu 21 Aug 2014, 12:20 am

Why do you say you can't use Hammerite on galvanised Mr Itch?

This is on the link you posted.

Hammerite
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Tow Itch
Dandy Expert

Posts : 3175
Join date : 2011-06-20
Location : Leigh Gtr Manchester

Re: Rust treatment and painting of metal chassis

Post by Tow Itch on Thu 21 Aug 2014, 1:02 pm

Phoenix wrote:Why do you say you can't use Hammerite on galvanised Mr Itch?

This is on the link you posted.

Hammerite

Yes and there is specialist primer too. I was referring to the original Hammerite, the no primer paint that can be applied over rust, which is what I think of given the term Hammerite. Saying Hammerite wouldn't make me think about their garage door paint either which can be applied to wood.

I wouldn't seriously expect neither you or navver to use standard Hammerite on galvanised surfaces. Truthfully I'm not completely sure if the legs are zinc passivated or galvanised in some superior way the doesn't show the normal crystalline marks of normal galvanising Can you use the original Hammerite on zinc pacification though zinc is the active component in galvanisation........ Break I've been reading up on galvanisation while writing this I think the legs might be electrogalvanised hence the appearance isn't like that of hot dip galvanising

So after meandering and rambling. I would'nt expect either you or navver to use "Hammerite" (as in original) on a galvanised surface but I might well expect any number of people to say "Oh Phoenix used Hammerite on this thats good enough for me" not realising that all wasn't as met the eye.

I do also do tend to get a hissy fit at manufacturers of (particularly paints and wood treatment products) who give half arsed instructions. Some of you may know how much I hate the "It does exactly what it says on the tin" advert because the tin tends to say bugger all about the product.
I used to use woodcare products from Rustins. they are much more helpful with their printed instructions, they have a FAQ section on their website they will offer help by email and though not mentioned on their website will get a specialist to talk you through any issues if needed. They do still list a general phone number. [You must be registered and logged in to see this link.] My prissy attitude to product labelling is also spreading to useless uninformative product web sites as well it appears.


Though talking about "original" Hammerite I do realise that virtually all paints are now water based low volatile organic matter products to protect the environment. If some were more bothered about their painting rather than the rest of the world boat paints are still composed on traditional lines.


Last edited by Tow Itch on Fri 22 Aug 2014, 1:47 pm; edited 1 time in total (Reason for editing : Must have been in a hissy fit. Add the letters in [color=#ff0000]red[/color] and remove the letter in [color=#00ffff]turquoise[/color] to get the original post to read in English)
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Phoenix
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Join date : 2011-09-07
Location : South Norfolk.

Re: Rust treatment and painting of metal chassis

Post by Phoenix on Fri 22 Aug 2014, 1:09 pm

In all honesty when we painted Phoenix's legs we used a can of plasti-kote metallic.
It was the only silver spray paint at our local Arkwright type iron mongers shop at the time.
As the legs slide in and out they get scratched any way so we will have to touch them up before any of you guy's see her again.  Wink

SMoo

Posts : 5
Join date : 2014-08-18

Re: Rust treatment and painting of metal chassis

Post by SMoo on Tue 02 Sep 2014, 10:10 pm

Hi all,

Thanks very much for all of your replies. I did post a reply using my phone, but for some reason it didn't work and I've only just noticed! Embarassed

I did some investigation of this myself and came across some people on a forum talking about Hammerite alternatives. They seemed to strongly recommend POR 15.

[You must be registered and logged in to see this link.]

The following link is from a forum talking about a better alternative to hammerite for marine trailers- a couple of people strongly recommend POR 15

[You must be registered and logged in to see this link.]

Also, the following links contains people talking positively about it for use on cars

[You must be registered and logged in to see this link.]

Still not sure which I'll go for, but will consider your advice carefully- thanks again!

SMoo

Posts : 5
Join date : 2014-08-18

Re: Rust treatment and painting of metal chassis

Post by SMoo on Tue 02 Sep 2014, 10:26 pm

Also, thanks to phoenix for the welcome!
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Tow Itch
Dandy Expert

Posts : 3175
Join date : 2011-06-20
Location : Leigh Gtr Manchester

Re: Rust treatment and painting of metal chassis

Post by Tow Itch on Wed 03 Sep 2014, 5:58 pm

It looks like you have used more knowledgeable forums.
A whole range of POR 15 products and kits on frosts website [You must be registered and logged in to see this link.]
Practical Classics often do a rust preventative test every couple of years but I couldn't find any reference of more use than these two links  http://www.pistonheads.com/gassing/topic.asp?f=23&t=348806 and [You must be registered and logged in to see this link.]  Sure that muddys the water even further. On fresh steel galvanizing paint is supposed to work [You must be registered and logged in to see this link.]

Sorry not to be clarifying anything other than perhaps that steel tube rusts from the inside so perhaps some work needed there.

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Re: Rust treatment and painting of metal chassis

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