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Don't think that is the case here, Darrell. I've talked with a few other people who verified they had LOS cars with this color underside too, but not as much as mine. I called Camaro Restorations in NY and talked with them and they have only seen a few LOS cars, mainly Norwood, but remember 1 or 2 having the bluish underside and not knowing what it was or where to get the paint so repainted black. I'm beginning to believe that is the case with many of the LOS cars that have been restored and people seeing them now, think it is original. 2 of the people had '69's, so my thinking this was a '67 only anomaly got thrown out too.

Latest unveiling... original, untouched factory undercoating in the right rear wheel well. Normally, I go after this with an air chisel and dull blade and have it all off in 10 minutes. I didn't see any evidence of the blue primer in here, but started, carefully, scrapping down thru the undercoating looking for any sign of blue. As I got to the bottom of the undercoating, I was seeing a color I thought was bare metal, so stopped in that area and tried another. When I got the same result, I scrapped harder to clean up the metal and there was the Blue !!  When I put the trunk floor in 4 years ago, I had used the air chisel around the edge for welding and had gone to bare metal. I used scotch bright pads to clean the edge of where I had bare metal to show the 3, distinct, colors of bare steel, blue primer and, what I then realized was, Gold overspray on the primer. ALL of this UNDER the factory applied undercoating....

More cleaning and documenting of...whatever this is...
This was interesting. This clip has a plastic like washer under it to seal the hole ?





Rubber floor pan plug, with paint.



Traction bar bracket to floor fasteners that wasn't used, as the car is an auto. Paint in the threads.



This is, also, an interesting sequence. The undercoating appears to have been applied before the plastic drain hole plug was squished down into it.



The undercoating on the pan in the previous pic was, mostly, carefully removed to reveal the paint under it.



I, then, wiped the pan with clean water to remove any cleaner residue and took pics of the application method. The paint was applied from the center of the floor facing out, as evidenced by the "leeward" sides of the beads having nearly no paint on them.

The only owner history I have is the previous owner on Point Reyes, CA. I got nothing else with the car. I've never felt it was worth getting the shipping data for the car, as it doesn't have the original engine or transmission, which was a powerglide. Maybe I should re-think that and see who it delivered to. There is a guy on the Yenko site that seems like a magician at finding old newspaper ads for these cars, but he hasn't come up with anything from the CA plate. He wants the shipping data to work with too, so I may as well get it.
Options: besides the SS350/powerglide, it has a console, the wood look steering wheel, speed minder, deluxe interior with the fold down back seat and the rs option. No radio came with it, but the speaker and rear brace was still there and, what appeared to be, the original package tray cardboard was under the shag fur cloth covering it and did not have a rear speaker hole. Power steering but manual 4 wheel drums.
As for the paint, after cleaning with just the simple green and cotton cloths, I can rub it to a fairly decent shine, more than I thought a primer would provide, but if it is lacquer, maybe it will shine some ? I'm not experienced with that product, but if it went thru a "blending" oven, it may have brought out a shine. It certainly is smooth. I haven't wiped a test area with lacquer thinner, but I suspect it will wipe off. I'll try that later this afternoon. I want to see if there is any evidence of black primer, or dip paint under it. If there is, it's very thin, as I don't see any black under, or around the edges of the blue.
I thought I had a pic of the TT on Photobucket, but didn't find it yesterday. I'll upload another and post it.

[i thought the car needed the bright work to stand out.]

all of the original stainless was polished not chrome plated and the original  bumpers and rear guards  where done by aih chrome plating they only do the show chrome i thought the car needed the bright work to stand out.

A Cortez Silver, '69 Z/28 hardly needs extra bright chrome to stand out LOL. I doubt many of the dozens of people flocking around it even noticed the bumpers as exceptional. I thought you were going to need to run people over to get it lined up with the lift for the underside inspection.

This car NEVER received a restoration of the level you suggest. It has had shoddy repair and paint work done to it in the past and I have documented every part of it through out my EXTENSIVE restoration. There is no way anyone took this down to a bare shell, sanded to bare metal and then painted the bottom blue. This isn't my first rodeo either, as they say. I've taken a number of cars down to shells and rebuilt them and have a very good idea of what I'm looking at. You haven't seen it in person nor have a good explanation of why it is blue, other than you don't want to believe it's original. I'm really tired of you being negative or any useful advice as to how this car got the bottom painted blue.
How do you explain the blue paint on the bottom of the Z28

I had a feeling I had seen this before and went back thru my archives to a '67 GTO I restored many years ago and I believe that has something very similar on the floor, but it was so rusty, it's hard to say for certain. I replaced everything from the firewall to the rear bumper on that car, but some of the pics show a bluish hue thru the rust and dirt. One thing I am looking at is, the Fremont plant built A bodies for all the makes, Pontiac, Buick and Olds, besides the Chevrolet's Chevelle and Camaro. Was this something that would have been normally painted on the higher end cars ?? Was mine an employee ordered car that got a little something extra on the way down the line ?
When I started this thread, I thought this was a normative practice and was only looking for info to replicate it. Instead, it seems to have opened Pandora's box and could lead to new information, if someone with experience and sources, cared to go down that rabbit hole...

Put the body on a roto and cleaned with Simple Green. The paint is everywhere, even under the rear brake hose bracket and hard line clips. If this is not factory, someone did a hell of a job stripping this car to the bare shell to paint it...
Jon, the color in the first pics isn't accurate, as I was laying on a creeper under it and the lighting was poor. With the body rolled up, into the overhead led lights, this is very close to the pic of the Z car, but there is much more on mine...

Are we even certain that's factory sound deadener/undercoating on top of the blue paint?  As stated earlier, a lot can happen over the years.

What appears to be dirt on the coating is Gold overspray. I cleaned that area twice with Simple Green, just to be certain it was paint and not years old grime.

That was in reference to the pic I posted of the 3 colors in the cowl... not the underside.

This pic is from a highly documented, original, untouched Z28 that was certified at MCACN last year. The blue hue on the floor is the same as what I am finding under 50+ years of crud. This Z is Mountain Green and was built at the end of the '67 run and mine was built the 3rd week of Feb.

Curious what that will show to you.

No, the gold body color is on top of the blue. Neither tag has been off and the body number is in line with the build week.

I was washing the left frame rail to get ready to scuff and found evidence that the floor was painted by Fischer. I removed the axle bump stop and I believe I am the first person to do that since the day the car was built, and the blue color is under that too. As well as a dusting of Gold overspray. The overspray is heavier on the frame rail, but some must have gotten by. There are runs in the blue in the torque box area that have gold dust on them too. It's even inside the tube for the shackle bushings. Then I scrapped off a small area of the original undercoating and the blue is under there as well.

I was wondering why someone would paint the underside blue on a gold car, but now I recall seeing blue paint over 2 coats of gold and under2-3 coats of white in some places I stripped, so it may all make sense. Recently sanded all of it off in the cowl... the color does look similar.