OB 928 refresh

Tech and Talk about the Porsche 928
Pefa
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When the car is at the paintshop I take the opportunity to clean all the interior parts.
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Tom
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Looking forward to the post-paint pictures! Someday I'm going to get the 951 painted, so all inspiration is helpful. :)

Did the 928 come from the factory with air horns? :o

#12

Pefa
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Tom wrote: Mon Oct 11, 2021 10:48 am Looking forward to the post-paint pictures! Someday I'm going to get the 951 painted, so all inspiration is helpful. :)

Did the 928 come from the factory with air horns? :o
The painter is prepping the car this week. All the parts like Doors, bonnet, fenders etc are prepped and ready for paint. The car will sit after prep for awhile before paint. I will go to the shop tomorrow with the bolts for the fenders and doors that also needs paint and hopefully I can take some good pictures of the progress.

Yes the horns are factory parts 🙂

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The painter is taking the body of the car back to bare metal before primer.
All is in great shape, no visable corrosion.
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#14

dr bob
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One of the features of the 928, especially after some history with earlier Porsches, was the full dipped rust-proofing layer applied to the body before painting. I'm sure your painter is aware that he'll want to apply a similar treatment to the exterior metal as part of the refinishing process. Proper bare-metal prep is particularly important on the aluminum body parts like doors, hood, and front fenders. Your work will include a modern paint system so all can be easily considered in the prep and base layers. The original paint systems, particularly for the Glasurit single-stage solid colors, needed extra steps to work with the then-new-technology aluminum and polyurethane body materials.

Lots of work, but the finished product will be wonderful. It's pretty amazing that the cars were originally assembled and finished in such a short time at the factory. What takes me weeks to do myself took them minutes to maybe hours.

Thanks for sharing the pictures and descriptions!
dr bob

1989 928 S4, black with cashmere/black inside
SoCal 928 Group Cofounder
928 Owner's Club Charter Member
Former Ex Bend Yacht Club Commodore Emeritus

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#15

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dr bob wrote: Sat Oct 16, 2021 12:23 pm One of the features of the 928, especially after some history with earlier Porsches, was the full dipped rust-proofing layer applied to the body before painting. I'm sure your painter is aware that he'll want to apply a similar treatment to the exterior metal as part of the refinishing process. Proper bare-metal prep is particularly important on the aluminum body parts like doors, hood, and front fenders. Your work will include a modern paint system so all can be easily considered in the prep and base layers. The original paint systems, particularly for the Glasurit single-stage solid colors, needed extra steps to work with the then-new-technology aluminum and polyurethane body materials.

Lots of work, but the finished product will be wonderful. It's pretty amazing that the cars were originally assembled and finished in such a short time at the factory. What takes me weeks to do myself took them minutes to maybe hours.

Thanks for sharing the pictures and descriptions!
Thank you for the information.

One more reason for taking the car back to bare metal was that the original base primer started to let go from the metal/galvanisation with small bubbling occuring. Also with both the original Moccaschwartz and the red metallic color on top made it very thick so adding another coat would not be a good option.
With too many layers the edges on the different panels will be to "round" and not look good.
We will use a modern 2 component Glasurit paint without clearcoat. Reason for choosing to exclude clearcoat is that it will be too shiny with it in a way that these cars did not look from factory with the solid paints.
The painter is a very experienced professional and I am confident he will use the proper products for the given materials.

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Tom
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Pefa wrote: Sat Oct 16, 2021 2:03 pm
dr bob wrote: Sat Oct 16, 2021 12:23 pm One of the features of the 928, especially after some history with earlier Porsches, was the full dipped rust-proofing layer applied to the body before painting. I'm sure your painter is aware that he'll want to apply a similar treatment to the exterior metal as part of the refinishing process. Proper bare-metal prep is particularly important on the aluminum body parts like doors, hood, and front fenders. Your work will include a modern paint system so all can be easily considered in the prep and base layers. The original paint systems, particularly for the Glasurit single-stage solid colors, needed extra steps to work with the then-new-technology aluminum and polyurethane body materials.

Lots of work, but the finished product will be wonderful. It's pretty amazing that the cars were originally assembled and finished in such a short time at the factory. What takes me weeks to do myself took them minutes to maybe hours.

Thanks for sharing the pictures and descriptions!
Thank you for the information.

One more reason for taking the car back to bare metal was that the original base primer started to let go from the metal/galvanisation with small bubbling occuring. Also with both the original Moccaschwartz and the red metallic color on top made it very thick so adding another coat would not be a good option.
With too many layers the edges on the different panels will be to "round" and not look good.
We will use a modern 2 component Glasurit paint without clearcoat. Reason for choosing to exclude clearcoat is that it will be too shiny with it in a way that these cars did not look from factory with the solid paints.
The painter is a very experienced professional and I am confident he will use the proper products for the given materials.

Sounds like your guy is trying to get the car 'just right' -- can't wait to see it!!

#17

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Tom wrote: Sat Oct 16, 2021 4:32 pm
Pefa wrote: Sat Oct 16, 2021 2:03 pm
dr bob wrote: Sat Oct 16, 2021 12:23 pm One of the features of the 928, especially after some history with earlier Porsches, was the full dipped rust-proofing layer applied to the body before painting. I'm sure your painter is aware that he'll want to apply a similar treatment to the exterior metal as part of the refinishing process. Proper bare-metal prep is particularly important on the aluminum body parts like doors, hood, and front fenders. Your work will include a modern paint system so all can be easily considered in the prep and base layers. The original paint systems, particularly for the Glasurit single-stage solid colors, needed extra steps to work with the then-new-technology aluminum and polyurethane body materials.

Lots of work, but the finished product will be wonderful. It's pretty amazing that the cars were originally assembled and finished in such a short time at the factory. What takes me weeks to do myself took them minutes to maybe hours.

Thanks for sharing the pictures and descriptions!
Thank you for the information.

One more reason for taking the car back to bare metal was that the original base primer started to let go from the metal/galvanisation with small bubbling occuring. Also with both the original Moccaschwartz and the red metallic color on top made it very thick so adding another coat would not be a good option.
With too many layers the edges on the different panels will be to "round" and not look good.
We will use a modern 2 component Glasurit paint without clearcoat. Reason for choosing to exclude clearcoat is that it will be too shiny with it in a way that these cars did not look from factory with the solid paints.
The painter is a very experienced professional and I am confident he will use the proper products for the given materials.

Sounds like your guy is trying to get the car 'just right' -- can't wait to see it!!

Yes he has helped me previously with great result. First when I made a total renovation of the 1989 944 Turbo Cup car (now sold) and a couple of years back when I built my 968 Turbo S/RS replica.
On the Cup car we used the same resoning as with the 928 were original look and finish was the main criteria.
One thing to consider though is that modern paint systems are not as durable as the systems of yesterday so if one chooses not to use clearcoat it will not be as resilient to the elements.

In my case the Cup car became a show car and in the case of the 928 it will only be used in the summer and mostly under roof when parked.

The Maritime blue 968 however which I use as intended on the track got a modern system including clearcoat. That finish clearly differs in look from the stock porsche finish that was without it.

Just something to think about when one wants to refurb a paintjob

89 Cup at the track after rebuild.
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Ok so now the body has been prepped and now ready for paint🙂
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Tom
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Looking great! Tons of effort showing there in terms of taking things off/apart to avoid the cheap 'respray' look. This should look awesome when done! Did they remove the gas filler pipe!?! :shock:

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