1970 914-6 Bottom Paint Question? Options

[racerbvd]

I got a big question on our 914-6, on the bottom, mine has been painted a different color (from the factory) and undercoated:confused:
My paint guy says that he finds no traces of Blue on the bottom and that the color & under coating appear to have been applied from the factory..
, (IMG:http://www.914world.com/bbs2/uploads_offsite/forums.pelicanparts.com-226-1320700084.1.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/forums.pelicanparts.com-226-1320700084.2.jpg)

(IMG:http://www.914world.com/bbs2/uploads_offsite/forums.pelicanparts.com-226-1320700085.3.jpg)
This is a Concours Restoration, so it has to be correct, so on one hand I'm thinking just Paint the bottom the matching Blue, but on the other hand, Porsche was also known to sometimes spray the bottoms with what ever was left in the Spray gun and I know of one collector who has a few 914-6s, like mine, both 70s and both OEM, yet one of his 1970s Six's has no coating; another '70 does:confused:
I need to figure this out ASAP as the car is ready for Paint..
(IMG:http://www.914world.com/bbs2/uploads_offsite/forums.pelicanparts.com-226-1320700085.4.jpg)

[Towarish]

I just read this discussion and maybe I can contribute a little to find the truth.
All 914 bodies were built treated and painted in Karmann factory Osnabrueck, though 914/4 and 914/6 in a different way.
There is a Porsche sheet dated 11/20/70, "Technical Information No.6, which says :
"The underside and cavities of all chassis are factory phosphatized and dipped in primer. Besides, the undercarriage is protected against corrosion with filler and lacquer "(here it does not say what color !)
"All 914/6 ordered by Porsche Zuffenhausen are protected by a PVC layer. (grey)
Both models are additional sprayed with a protection on wax basis."
So, IMHO any 914/6 with painted underfloor is not original appearance. Exceptions are wheelhouses and longitudinals, which are sprayed one time in a thin layer over PVC .
A black layer could be an additional Teroson protection ,which was applied later by customers. But you will find this black tar spray on the mechanic parts like axles as well.