Author Topic: Repairing flaking paint on Perentie  (Read 240 times)

Offline Perentie1989

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Repairing flaking paint on Perentie
« on: January 01, 2018, 01:13:40 PM »
Hi,
I have flaking original paint in the foot-well and on the roll-bar/canvas frames.  Under the flakes is a white dust and surface rust.  Photo attached.

I'm hoping others have addressed this problem.  Do I need to strip back to metal, prime etc or is there another way?  I started to strip it back from one frame and the white dust seems to have undermined the whole surface even though it looks otherwise ok.

Thanks for your replies.

Dave

Offline AGAS 5

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« Last Edit: January 01, 2018, 01:37:37 PM by AGAS 5 »
Series 2A SWB 113-300 VTF
Perentie GS 50087

Offline Perentie1989

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Re: Repairing flaking paint on Perentie
« Reply #2 on: January 01, 2018, 02:08:06 PM »
Thanks, I'll make sure I work safely.

Begs the question, how do we preserve these vehicles paintwork?


Offline David

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Re: Repairing flaking paint on Perentie
« Reply #3 on: January 01, 2018, 04:08:07 PM »
Out of interest does anyone know what the white powdery layer under the top coat is, I guessed only the top coat is the polyeurathane.  The inside of one of the lockers on my RFSV  had the top layer of paint peeled off leaving just the white powdery layer, which I just roughly sealed as I was unsure, but I expect the sealer will come off with the powder in time so will need re-coating.  It looks like it may have been used as an esky or something as the other side is fine, and it is odd just one side is affected.
Land Rover Perentie RFSV 50.417

Offline 303Gunner

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Re: Repairing flaking paint on Perentie
« Reply #4 on: January 01, 2018, 08:12:25 PM »
The white dust is Zinc Hydroxide, or the byproduct of corroded galvanising. It can appear on either electroplated galvanised sheet metal like the lockers, or on hot dip galvanising like the roll bar. Zinc Hydroxide won't hold a paint coat and will continue to corrode. You need to wash it back with a weak ammonia-based rinse (really weak, using household-laundry grade ammonia), and scrub it off with a stiff bristle brush. Unfortunately, this oxidation will be happening under other areas of paint nearby that are not yet peeling, so to stop it you will need to remove the paint back a couple of inches around the affected area. The affected area will no longer have any galvanised protection, so you need to think of how you intend to prep the bare steel to prevent good old regular rust. Provided you have removed all of the Zinc Hydroxide, those cold-gal type paints can work well as they are rich in zinc and tie into the sound galvanising around the affected area. If money was no object, then sandblasting and re galvanising would bring it back like new (obviously!).

Offline Perentie1989

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Re: Repairing flaking paint on Perentie
« Reply #5 on: January 01, 2018, 09:55:11 PM »
Thanks, thats super helpful! Any other comments much appreciated.

Offline 303Gunner

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Re: Repairing flaking paint on Perentie
« Reply #6 on: January 02, 2018, 06:17:55 AM »
Oh, forgot to mention, Protec Cam paint will then topcoat over the cold-gal primer quite well.

Offline Ford Blitz

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Re: Repairing flaking paint on Perentie
« Reply #7 on: January 02, 2018, 04:41:39 PM »
and a lot safer than PUP to apply!!

Offline Chazza

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Re: Repairing flaking paint on Perentie
« Reply #8 on: January 07, 2018, 06:57:36 PM »
I wonder if a coat of Penetrol would stop the reaction forming the zinc-hydroxide?

Cheers Charlie
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