Author Topic: What to apply to the chassis?  (Read 5715 times)

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Offline fridayman

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What to apply to the chassis?
« on: July 07, 2014, 02:51:24 PM »
For those that have applied some sort of protective coating or treatment to the underside of their vehicles, themselves... what have you used and how did you apply it?

I've bought a needle scaler to get most of the rust off, and will then apply either a phosphoric acid based rust converter to deal with the rest, or the oil based Penetrol to seal moisture out - I haven't decided which yet. I'm also wondering what to apply over the initial rust treatment. If I go with the rust converter, I might see if I can spray fish oil on with a spray gun. But if I decide to use the Penetrol instead, i might try some sort of tough paint - any recommendations?

Offline Footy Shorts Shane

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Re: What to apply to the chassis?
« Reply #1 on: July 07, 2014, 03:25:45 PM »
Phosphoric acid must be neutralised with water. You can't just spray/paint it on and leave it. Paint it on, scrub it in (wire brush, scotch pad etc) don't let it dry, wipe it down with a damp rag, dry it, wipe it down with metho or prepsol then paint it straight away. It's good stuff, but if not applied correctly, will do more damage than good.

WURTH 0893110 is the product for you. It's great stuff.
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Offline fridayman

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Re: What to apply to the chassis?
« Reply #2 on: July 07, 2014, 03:44:08 PM »
Phosphoric acid must be neutralised with water. You can't just spray/paint it on and leave it. Paint it on, scrub it in (wire brush, scotch pad etc) don't let it dry, wipe it down with a damp rag, dry it, wipe it down with metho or prepsol then paint it straight away. It's good stuff, but if not applied correctly, will do more damage than good.

WURTH 0893110 is the product for you. It's great stuff.

Thanks Shane, I wasn't aware of that.

Offline BillC

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Re: What to apply to the chassis?
« Reply #3 on: July 07, 2014, 06:43:07 PM »
I have used penetrol at work on the tray of a rusty trailer and cannot speak of it highly enough. I now use it on everything. I had tried all sorts of things previously and nothing came close to the way the penetrol stopped it in it's tracks.

I always have some on the shelf for when I am painting.

Bill

Offline grafy82

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Re: What to apply to the chassis?
« Reply #4 on: July 07, 2014, 07:07:24 PM »
Give it a good wire brushing and then soak it with lanolin. Paint and everything else will just come off again. Just wash it down after dirty trips and soak it in lanolin again.
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Offline shanegtr

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Re: What to apply to the chassis?
« Reply #5 on: July 08, 2014, 12:00:23 AM »
i might try some sort of tough paint - any recommendations?
I brought some POR15 for under my camper. The stuff is supposed to be tough and is bloody expensive, and didnt last anywhere remotely as long as I had hoped for. If what your painting is going to get peppered with stones, then dont bother using it. I think you'd have better results just using some cheap rattle can paint and giving it a touch up after every trip

Offline fridayman

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Re: What to apply to the chassis?
« Reply #6 on: July 08, 2014, 03:45:10 PM »
I've heard of POR 15, but it seems that it requires you to follow the prep instructions to the letter, and the prep requires you to use more of their other products... KBS (an Aussie version of POR 15) gets good reviews.

Offline fridayman

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Re: What to apply to the chassis?
« Reply #7 on: July 08, 2014, 03:46:00 PM »
I have used penetrol at work on the tray of a rusty trailer and cannot speak of it highly enough. I now use it on everything. I had tried all sorts of things previously and nothing came close to the way the penetrol stopped it in it's tracks.

I always have some on the shelf for when I am painting.

Bill

Did you mix it with paint, or do you apply it directly to the surface on its own? And have you painted over it?

Offline McTavish

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Re: What to apply to the chassis?
« Reply #8 on: July 08, 2014, 10:39:51 PM »
Like BillC I have used Penetrol too and found it to be brilliant.
   
After wire brush etc apply directly and leave to dry and from what I can gather it neutralises the remaining surface rust.   
It spreads so easily you don't need to use much at all really.

Just to be sure I then reapplied, let it dry again then used the finishing paint. 
I then used some basic black automotive paint on the axle and springs which was too thick (I like to apply multiple thin layers) so I mixed some Penetrol directly into the paint tin to thin it out and it spread beautifully.   The trailer tub has hammertone paint so just sprayed on over the top and all good.

I haven't given the trailer a bush bashing on dirt roads to know for sure - but now after one year of general use and looks the same as the day I applied the paint.   No flaking at all.
So - my experience - can be used directly and/or mixed with the paint.   It does have a bit of a smell when applied but once dry no smell at all...
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Offline fridayman

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Re: What to apply to the chassis?
« Reply #9 on: July 09, 2014, 09:20:26 PM »
Thanks for that. It's made my mind up to try the Penetrol.

Offline BillC

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Re: What to apply to the chassis?
« Reply #10 on: July 09, 2014, 09:47:15 PM »
Did you mix it with paint, or do you apply it directly to the surface on its own? And have you painted over it?

I used the gerni to get rid of the worst rust, gave it a coat of penetrol and the mixed penetrol and primer. Haven't touched it for about 3 years. I thinks that is similar to what is on the side of the tin

Bill
« Last Edit: July 09, 2014, 09:49:36 PM by BillC »

Offline shanegtr

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Re: What to apply to the chassis?
« Reply #11 on: July 09, 2014, 10:25:53 PM »
I've heard of POR 15, but it seems that it requires you to follow the prep instructions to the letter, and the prep requires you to use more of their other products... KBS (an Aussie version of POR 15) gets good reviews.
I havent looked into KBS - but I dont the POR 15 thing years ago. The sides that havent been pepper with stones are perfectly fine

Offline dlncooke

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Re: What to apply to the chassis?
« Reply #12 on: July 10, 2014, 05:23:49 AM »
I was looking @ putting this under our Dmax, mainly in the wheels arches.
http://www.supercheapauto.com.au/online-store/products/Septone-Brushcote-Body-Deadener-4-Litre.aspx?pid=3186#Cross

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