Primer for bare metal?

Hey, I'm going to soon repaint my landrover and have decided to completely strip her of paint down to bare metal, because some of the surfaces are very rough (bad paint work), and to help prevent rust and treat the current rust.

Would I be able to use this primer, on the bare metal? and do I just clean the bare metal with alcohol prior to priming?

Landrover Vehicle Anti Corrosive Primer - 4 Colours - 5 Ltr | eBay

Many thanks in advance!

It doesn't state if its self-etching, which it needs to be for the aluminium.

Ah that's what I was worried about, could you recommend a primer that would be more suitable? an anti corrosive one that can be used throughout the entire landrover on bare metral

Infact, would it be possible to go over the entire LR with a etch primer, then anti-corrosive primer? Would this give added anti corrosive benefits?

Two-pack primer is best if you are spraying, but for brushing on to steel or alloy this one sounds OK: Pro-Matic 1K Self Etching Primer | eBay

Yes you need to use a normal primer on top of the self etch, the one you suggested is probably good.

Ah right great,yeah I will be brushing/rolling, the guy that sells the landrover anti-corrosive primer also has landrover self etching stuff, so I was just going to get that, think this will be good?

Etch Primer Paint - Grey - 2.5 Ltr | eBay

Don't really know, it seems to be for ferrous metal only.

You want acid etch primer

Don't worry about going back to bare metal that will be a right ball ache. Just flattening it off with a sander, etch prime any bare bits were you do go through and then paint on top. That will be fine!

Ah right, just worried about corrosion with the age, could you link a suitable primer for the bits i have to sand right down? because there are some very rough parts, I also need to fill a lot of areas in with filler

kmanderson62 said:

Ah right, just worried about corrosion with the age, could you link a suitable primer for the bits i have to sand right down? because there are some very rough parts, I also need to fill a lot of areas in with filler

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If you're going right back to bare metal then you probs be best using a chemical peal and scraping the bad paint off. Bare metal, lightly key it, and then the self etching primers mentioned before. I'm not too clued up on painting etc but I'm sure there's plenty of how to's on the old internet.

kmanderson62 said:

Ah that's what I was worried about, could you recommend a primer that would be more suitable? an anti corrosive one that can be used throughout the entire landrover on bare metral

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U Poxy 2 pack (non iso stuff - so safe) Acid Etch, awesome stuff, very fast air dry time, and tough as boots.

Do a forum search for Defender Bodywork Rebuild by me, and skip to the painting sections you will see it in action, also self levels that stuff 1 litre, which makes 2 mixed, did my whole Landy more or less and gave me spare.

On good paint this will also do well just to etch into the old paint and give you a good base coat.

Hi there, you've probably painted by now but if you haven't.... where you have bare aluminium panels you need to use the etch primer which has a phosphoric acid base then go on top with a high build primer, if you're painting over steel then you want a zinc rich primer to give you the best protection. If you have rust then it's not aluminium! Aluminium oxide on pure ali is a white powder but fretting corrosion looks like cocoa powder. hope that helps.

flat said:

You want acid etch primer

Don't worry about going back to bare metal that will be a right ball ache. Just flattening it off with a sander, etch prime any bare bits were you do go through and then paint on top. That will be fine!

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+1

iirc zinc chromate etch used to be the thing to use on alu.. god knows now with all the regs.

Ah right great, does anyone know a good acid etch primer? I can only find etch primers, I have a regular zinc primer though, then I can get to painting Thanks guys!

I would use any self-etch primer advertised as suitable for aluminium. The term "acid etch" is an old description, not in common usage. On bare steel I have always used phosphoric acid solution to etch the surface, followed by a good anti-corrosion primer.

Everyone has their own ideas about painting, so you probably won't get agreement on a forum.

Ah right, so what does it actually mean by etching? Think you could post a simple stepped guide, like, this is my idea of how to do it

1) Strip paint with sandpaper/orbital sander, sand off all rust too
2) Wipe down bare metal with white spirit
3) Fill areas that need to be filled then sand flat
4) Coat in Etch primer, let it dry for 1-2 days
5) Coat in Anti-Corrosive primer, let it dry for 1-2 days
6) Coat with NATO Green paint

Is that correct? I don't really understand the whole etching process

Sounds good, self-etching simply means that the paint will adhere to the alloy surface, allowing overcoating with other paints. Phosphoric acid solution is a good treatment for steel as it will dissolve rust and etch/passivate the surface. If you simply apply an etch primer to steel, you must eliminate all traces of rust first.

Ah right, will sanding it all down do that? I have phosphoric acid and kurust, but i was just going to screw it and sand the whole thing down to bare metal taking all rust with it, then paint it all, thoughts?

kmanderson62 said:

Ah right, will sanding it all down do that? I have phosphoric acid and kurust, but i was just going to screw it and sand the whole thing down to bare metal taking all rust with it, then paint it all, thoughts?

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"Bare"ferrous metal will still have plenty of rust on it at the microscopic level. I would use a rust-resisting primer on all ferrous metals.
I don't think you will get best results using the same primer on steel and the alloy body panels. AFAIK the birmabright alloy is always painted with etch primer first.

Ah alright, so should I use the etch primer, which in the description says its rust resisting first, then on top of that, an anti corrosive primer, then my top coat on all surfaces? I can't really tell what needs what to be honest, so that way seems fool proof

The etch primer I was going to go for

Etch Primer Paint - Grey - 2.5 Ltr | eBay

Says in the description it has modified zinc for anti corrosive properties

Then this on top of the etch primer

Landrover Vehicle Anti Corrosive Primer - 4 Colours - 5 Ltr | eBay

And finally this

***Aesop's Military Vehicle Paint 2.5 Ltrs & 5 Ltrs*** | eBay

I know the 2 primers may seem un required, but would it possible give added benefits, with the under layer of etch primer with zinc, then a anti corrosive primer on top of that?