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Old 04/23/2013, 05:18 AM   #1
Forsche
 

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Red Oxide, blue paint and gas tank originality

Started doing some cleaning on the underside of of the CS yesterday. I am actually surprised how clean the car is! Almost seems TOO clean for a 45 year old car. Makes me think the 44k miles could be actual. Would be great if some of you experts could see and give me your opinion since I know so little about mustangs or the CS. Hopefully will learn more if we make it to the Evans Georgia mustang show in a few weeks.

I'm finding what looks like a blue overspray on the underside of the body panels (trunk area) just behind the gas tank. There is also some near one of the rear shock mounts and also a bit on the back of the gas tank. Any idea why this is there?

Also, when I see restored cars the entire underside is sprayed in the red oxide color. I'm not really seeing much of anything that looks to be red oxide on the underside. Does this wear off? I haven't gotten to the wheel wells yet although I did notice some red oxide in the inside of a couple of quarter panels. There does seem to be black paint on the underside of the floor panels on each side of the car but not in the drivetrain tunnel. Is this black paint likely original or painted later for undercoating or "detailing"?

Finally, is there a way to tell if the gas tank is original?

Thanks for the help.
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Old 04/23/2013, 06:26 AM   #2
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When the car was originally assembled, it was dipped in Red Oxide so the entire car will have red oxide, exterior and interior. There should be drips present on the underside of the car. Sound deadener was then applied to the firewall wherever something came through the firewall and to the inside of the quarter panels inside the trunk and wheel wells. The car was then painted body color, exterior, interior, and trunk area. The engine compartment was painted black from the top side down, so the bottom side of the engine compartment would still be Red Oxide. Sound deadener was also applied above the rear axle assembly and a black sealant was applied around the seatbelt mounting plates. The blue you are seeing is unknown to me, but it could be an oily residue color from some of the sound deadener. The black on the underside may be dealer applied or previous owner applied. The underside should be Red Oxide with body color overspray, which would appear solid if you looked from the outside in, but if you have the car on a lift, you will see it is only on the planes facing outside. This is because the paint guns are aimed from the outside, so overspray would not hit the inboard planes. Do I make sense?

The amount of sound deadener depends on who was running the gun that shift. I have seen gobs of SD, to almost none. The pinch welds, located just below the rockers were painted black, even on black cars. This was done to hide the pinch welds from vision if you were standing back away from the car, it would appear to blend with the asphalt. These pinch welds ran from front wheel well to rear and from rear wheel well to rear valance.

As far as fuel tank, I will refer you to others with more experience.
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Mike Jewell
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Old 04/23/2013, 07:26 AM   #3
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Quote:
Originally Posted by somethingspecial View Post
When the car was originally assembled, it was dipped in Red Oxide so the entire car will have red oxide, exterior and interior. There should be drips present on the underside of the car. Sound deadener was then applied to the firewall wherever something came through the firewall and to the inside of the quarter panels inside the trunk and wheel wells. The car was then painted body color, exterior, interior, and trunk area. The engine compartment was painted black from the top side down, so the bottom side of the engine compartment would still be Red Oxide. Sound deadener was also applied above the rear axle assembly and a black sealant was applied around the seatbelt mounting plates. The blue you are seeing is unknown to me, but it could be an oily residue color from some of the sound deadener. The black on the underside may be dealer applied or previous owner applied. The underside should be Red Oxide with body color overspray, which would appear solid if you looked from the outside in, but if you have the car on a lift, you will see it is only on the planes facing outside. This is because the paint guns are aimed from the outside, so overspray would not hit the inboard planes. Do I make sense?

The amount of sound deadener depends on who was running the gun that shift. I have seen gobs of SD, to almost none. The pinch welds, located just below the rockers were painted black, even on black cars. This was done to hide the pinch welds from vision if you were standing back away from the car, it would appear to blend with the asphalt. These pinch welds ran from front wheel well to rear and from rear wheel well to rear valance.

As far as fuel tank, I will refer you to others with more experience.
Thanks, Mike. I'll have to take a closer look and take pics when I get it cleaned up a bit more. I'll attach links to two pics. One shows some of the blue paint. Clearly it is paint in my view and appears to be an overspray. The other pic shows the seatbelt mounting plate area. You can see a bit more blue paint, as well as the sealant around the plates but as you can see , there really appears to be no red oxide.

Sorry to use links. I haven't figured out how to do the thumbnails/pics imbedded in the post

Steve
https://www.dropbox.com/s/y2qfw7iq3xfjwsg/IMG_0313.jpeg
https://www.dropbox.com/s/w6xb0we8knevvvw/IMG_0315.jpeg
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Old 04/23/2013, 06:41 AM   #4
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Just another example of a dry climate car, that was stored in a garage for some or most of it's life. Carson City is in the high desert, that gets some snow.

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Old 04/23/2013, 07:17 PM   #5
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Quote:
When the car was originally assembled, it was dipped in Red Oxide so the entire car will have red oxide,
?

I have seen reference to unpainted areas for dolly marks on the underside. My understanding was they were "saturation sprayed" from below, thus common drip marks on the underside, and bare spots where it sat on the dollys. Interior was hand sprayed, not dipped... never heard of entire body dipping being used for red oxide...

Body color overspray onto the underside is common. Pinch welds should be blacked out as an indication of factory paint. Many older resprays cover it with new body color and don't go back and redo the balck.

I think the gas tank was installed post-paint, so should have no factory overspray on it unless there may have been a post inspection touch up required.
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Old 04/23/2013, 08:11 PM   #6
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Quote:
Originally Posted by dalorzo_f View Post
?

I have seen reference to unpainted areas for dolly marks on the underside. My understanding was they were "saturation sprayed" from below, thus common drip marks on the underside, and bare spots where it sat on the dollys. Interior was hand sprayed, not dipped... never heard of entire body dipping being used for red oxide....
Richard, You are exactly right. I don't know what I was thinking when I said dipped. Dah. Sorry for the mis-information. (I wrote that before I had my second cup of coffee this morning) LOL

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Old 04/23/2013, 09:10 PM   #7
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No worries... have plenty of my own "senior moments", sadly becoming more and more frequent!
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Old 04/24/2013, 02:56 AM   #8
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Thanks guys. anyone have any knowledge of knowing of a gas tank is original?
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Old 04/24/2013, 03:46 AM   #9
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"Some" have a stamping from the manufacturer on them, from the rolled sheet steel so no consistent location on any one tank AFAIK. I forget the markings.

And I believe "some" have date codes stamped on the mounting flange on the bottom of
the rear edge, usually about 3 to 4 four inches to the right of center. Not sure if that is consistent with 68's but have seen it on earlier cars.
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Old 04/24/2013, 03:47 AM   #10
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And from MCA docs...

"E. Gas Tank: Original type and Ni-terne steel finish. Drain plug required"
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Old 04/24/2013, 03:49 AM   #11
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Some info here...

http://forums.vintage-mustang.com/co...revisited.html
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Old 04/24/2013, 03:50 AM   #12
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and here...

http://forums.vintage-mustang.com/co...tank-logo.html
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Old 04/24/2013, 03:51 AM   #13
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stolen from the web...

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Old 04/24/2013, 05:43 AM   #14
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Originally Posted by dalorzo_f View Post
stolen from the web...

Interesting and helpful. I don't recall seeing a stamping but I'll take another look.
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Old 04/24/2013, 08:08 AM   #15
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It will not be on all tanks, and could be almost anywhere on the tank... if there.... date codes are probably more consistent.
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