Chassis/spaceframe and inside the engine bay repainting

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Golf Juliet Tango
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Chassis/spaceframe and inside the engine bay repainting

I have looked at the Frosts page https://www.frost.co.uk/paints-coating-plating/automotive-paint/rust-paint-treatment-solution.html

If I am reading correctly there are several manufacturers. POR-15 (well known), Eastwood and Granville.  The considerable range of offerings hardly helps on selection.  Does anyone have the experience to help?

Then of course, there are subsequent treatments - I have cans of two Dinitrol products, so that isn't (should not be) a problem.

 

The project is the engine bay of the 21 where there is flaking of the original powder coating, surface deterioration and general tiredness.

As it is a special car, there being just 48 of them, it is worth doing a proper job.

Jim 123
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Stephen, I am guessing that you are going to tackle this with the body and engine insitu. It is likely that there will be some corrosion present where the powder has flaked although this will not be always identifialble, and some areas may be difficult to access.  With your planned job, the top coat is likely to be less imortant than the substrate prep.  Forgive me if you are planninmg to do so, but to mention:

I'd suggest to abrade and fully remove all loose P coat and surface blemishes.  Abrade the existing sound P coat to provide a key for the next layers.  Neutalise any corrosion or pitting on exposed metal with Phosphoric Acid or a phosphate containg product. Apply a Zinc rich etch primer. Scuff lightly and clean the etch primer before the next layer.  Although it can be a bit difficult to work with, I'd then go for POR 15, or something simiar that can deal with heat cycles and fluid spills.

 

Jim

Golf Juliet Tango
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Hi Jim

I was planning to get the engine out (it would be first for me, so I am nervous about it - more nervous about putting it back TBH).  There are too many nearly unreachable areas with the engine in place (and the 21 has a full floor pan).

Thanks for your input.

Stephen Hubbard

Democratic dissent is not disloyalty, it is a positive civic duty

Jim 123
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Hi Stephen, Engine out sounds like a prudent step as this will certainly make access from the inside a lot better.

Even though there are not too many people with experience on the 21, I am sure lots of help and extra hands will step forward to help with the engine. In terms of fettling the chassis, would you get any advantage by putting the car up on trestles after the engine is out instead of axle stands. My thinking is that the working position would be less physically stressful, and illumination would be better.

Jim

21jigsaw
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Hi Stephen,

Best to get underneath and take off the floor. Also ensure there are suitable drain holes in the floor .

Dave

Englishmaninwales
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I refurbished the completely stripped chassis using the paint on POR 15 system. This was several years ago and the paint is still in good condition.

Remove the old powder coat with paint stripper, clean up any rust and throughly clean/degrease the chassis tubes with Marine Clean. Wash off with water and paint the POR phosphate etch solution and wash off (after the correct time on metal). Finally brush on the POR 15 paint, second coat if necessary before the first has fully cured. It cures to a smooth, durable, chip resistant surface.

The key is taking your time and throughly degreasing and washing off the etch after the correct time. 

Paul McKenzie
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There is a potential issue-several years ago Nitromors stripped paint very well as it contained both caustic soda and dichloromethane.  Now it doesn't contain caustic or DCM (banned by the EU) and it no longer strips paint. I don't know where you'd get something effective any more.

Englishmaninwales
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Good point, I used the old Nitromors and the powder coat stood no chance...as you say, the latest version is useless.

Golf Juliet Tango
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Hmmm...

Thanks. Re: washing off the Marine Clean and Etch Solution - how much water would I need? 

The car is at a lock-up garage ten to fifteen minutes walk from home. No power (so battery lights, battery tools or sheer manual effort) no water (so I would have to take a jerry can up)

Stephen Hubbard

Democratic dissent is not disloyalty, it is a positive civic duty

Englishmaninwales
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I used a 1 litre spray bottle refilled with tap water, mopped up with paper towels (cheap dairy paper rolls from the local Farmers Mart).

Golf Juliet Tango
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Super, so perfectly practical. Thanks.

Stephen Hubbard

Democratic dissent is not disloyalty, it is a positive civic duty