Is there a way to understand if a car was undercoated by looking on the broadcast sheet? My Hemicuda has undercoating, but in the past there is orange overspray on the wheel houses. I was wondering if the undercoating has been applied on the building lines or later during the first years of life of the car. Fuel lines are orange too...

I’ve seen lots of unrestored cars and have never seen paint overspray on fuel lines unless it was painted after it left the factory. Someone has been doing some painting on your car.

My original undercoated cars had it applied after paint, not before; there'd be undercoat overspray over the paint at the wheel-opening flanges & inner aprons.

I checked on the broadcast sheet and J55 is shown. So I guess the car had been undercoated at thr factory.
. When it had been repainted overspraywent everywhere...so eheelhouses are now orange.
Can somenody post some pics of correct finish for wheelhouses and underbelly?
Thank you for the help

The correct finish is undercoating with no paint on it.
Paint first.
Lines and fuel tanks and some shielding installed (depends on model)
Then undercoating.

Also, I think there were two coating processes. The first all cars got, and that was an undercoating in the wheel wells for stone chips and noise reduction. You will note this coating under the fenders to keep stones from imprinting the sheet metal from the underside. Then there is the undercoating option which gets sprayed everywhere. I believe in both cases the majority of the underside items were installed. This includes brake lines, fuel lines, fuel tank. Rear shocks (but they were squeezed into shipping position), front weather flaps attached to frame rails and inner fenders. I think the coatings were sprayed before the body assembly met the drive train assembly. So the lower control arms, front k-frame, rear axle and springs, exhaust, etc would not have coating. I hope this helps.

Roadrunner, this makes sense. Found undercoating everywhere...and looks original.