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McLaren MP4/6

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  • Member since
    October 2020
Posted by Scale-Master on Friday, September 1, 2023 1:44 PM

Thanks Greg!  But it's not done yet...

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

  • Member since
    October 2020
Posted by Scale-Master on Monday, September 4, 2023 1:31 PM
This is from 9-4-2015  (exactly 8 years ago):
It’s been well over a year since I last updated the work I’ve been doing on the body.  Every month or two I’d sand the wrinkles out and let it set, only to have new ones appear.  Sand them out, wait and repeat.  It looks like it might have finally stabilized, but I won’t be too surprised if it reoccurs either.  After all, it’s been the better part of five years since I started painting the body…
Last night I took another stab at it and after sanding out some ripples I blended in some red on the right side and sharpened up the lines on the front with some white.

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

  • Member since
    October 2020
Posted by Scale-Master on Tuesday, September 5, 2023 12:01 PM

To recap, I started this in September of 2009.  In January of 2011 I started noticing paint issues like cracking on the nose.  At that point it was all TS paints including the clear.  I fixed the nose by hand painting the damaged decals and then I sealed it in urethane.  Then the paint on the rear wing went bad and I had to make new decals as replacements were not available.  For five years I chased the paint on the main body.  In my mind I had to keep using the same TS paints until I could get a stable finish and apply the decals.  Then the plan was to clear it with urethane (as I had done with the nose and rear wing).  I would get it looking nice and a few to several months later it would pick up waves or even wrinkles.  I'd sand and buff them out, wait until the paint seemed cured and stable only to have it happen somewhere else.

 

Well, the paint never stabilized as of 2016 so I went on to several bigger and better projects and let the body sit in a safe place.  Out of sight, out of mind...   

And it really got bad; wavy, wrinkly and just plain wonky over the years.  The body actually cracked somehow.  I'm not sure if it was due to the paint, but it wouldn't surprise me.  From this point on I am sharing the current salvage work after putting it on hold for over nine years.

Here is what I'm re-starting with after I peeled some of the clear off.  I'm surprised it shed that so easily.

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

  • Member since
    October 2020
Posted by Scale-Master on Wednesday, September 6, 2023 10:30 AM
I washed it up to get a better idea of what I was dealing with.
The only option, as I see it, is to strip it.  Unfortunately the many layers of paint might as well be a combination of CA and stucco.  About 15% of it peeled off to what appears to be the base white.  I guess I forgot how many layers of both white and red paint I applied trying to get this to look decent and most of the red is now hard as glass and really well adhered.   (So it does eventually cure.)

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

  • Member since
    October 2020
Posted by Scale-Master on Thursday, September 7, 2023 10:39 AM
I softened the front section with alcohol and was able to scrape much of it off, then I hand sanded it smooth.   Some of the red on the rear peeled off too, with a good amount of forceful persuasion.   What had peeled off easily was only on the surface.  There's still a lot of paint under it.
There is good news as the cracks near the windshield were in the paint, not the plastic.

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

  • Member since
    October 2020
Posted by Scale-Master on Friday, September 8, 2023 9:17 AM
The sides/rear are a different situation. 
I softened the red a little with more alcohol and tried to scrape it off.  The right side was always more troublesome during the curing issues than the left for some reason.  It is many layers deep and rather nasty.

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

  • Member since
    October 2020
Posted by Scale-Master on Friday, September 8, 2023 9:19 AM
I decided to try brake fluid.  I am not a big fan of using it for stripping due to the damage it can do to some plastics, but even the 100% denatured alcohol wasn't cutting through the older paint.  I mummified the body with wetted paper towels and let it soak like this for about half a day.  The red bleeding out looked like a good sign.

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

  • Member since
    April 2003
  • From: USA
Posted by keavdog on Friday, September 8, 2023 10:31 AM

Hate backpeddling but looks like you're making progress.  I've had some luck removing paint with Testors ELO (pricey) and Purple Power.

Thanks,

John

  • Member since
    October 2020
Posted by Scale-Master on Friday, September 8, 2023 5:56 PM

Yes, I am moving in the right direction.  Purple Power would not touch this.  10-12 years of drying time, some in a dehydrator too made it pretty tough stuff.

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

  • Member since
    October 2020
Posted by Scale-Master on Friday, September 8, 2023 6:04 PM
Much of the layers of red and white were clearly softened by the brake fluid, but nothing sloughed off as hoped.  I scraped the gummy-ish paint off and gave it a good water rinse before wet sanding for the better part of the afternoon.  I should have taken a photo, but I went straight to sanding since it was still almost as nasty looking as the earlier photos.  Overall I am pleased with the progress.

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

  • Member since
    October 2019
  • From: New Braunfels, Texas
Posted by Tanker-Builder on Sunday, September 10, 2023 6:24 AM

Hi!

      I find at this point in building, that YES! it's gonna work and start getting all enthusiastic again. Looking Good!

  • Member since
    October 2019
  • From: New Braunfels, Texas
Posted by Tanker-Builder on Sunday, September 10, 2023 6:27 AM

Aha!Still Problematic huh?

 I have had that happen on some very intricate(Car of the Future Type, Customs)Some are still "Wonky" as you say. DOC.

  • Member since
    October 2020
Posted by Scale-Master on Sunday, September 10, 2023 12:30 PM

 

A couple rounds of spot repairs in addition to the cracked areas at the cockpit, and a coat of white primer, and it looks ready for some TS-26 White. 
By 2011 I had a pretty good idea of what the cause of the issue was, and after a dozen years I'm sure that I have figured out the root issue from working with the same paints in different applications and combinations on several other projects since I started this one.  Those later ones all turned out well and have proven to be stable long term as well.
The fluorescent red cures at a much different rate than other TS colors and the clear.  Yes, it dries in about the same time frame and even feels dry to the touch, but it takes a lot longer to fully cure than both most other TS colors and the clear.  While the clear also takes longer to cure than many TS colors, if it is applied to the fluorescent red before the red is fully cured, it can shrink and pull the softer red paint out of shape as it did on this body.  The process that has worked long term every time for me is simple, use a urethane clear coat instead of the lacquer clear and let the red dry for a good bit longer than other TS colors.

 

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

  • Member since
    October 2020
Posted by Scale-Master on Tuesday, September 12, 2023 10:34 AM
After a few coats of TS-26 Pure White have had plenty of time to dry, it's time to start masking…
The red was built up until it more or less matched the other parts painted the same color a decade or so ago.  (Yes, it is the same batch of paint.)
This looks acceptable.    Now it will sit and cure for at least a month, maybe two, maybe more. 

Build what you want and build it for yourself, the rest will follow... Mark D. Jones

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