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Posted by: pek771 Oct 12 2021, 07:49 PM

I can't determine what treatment was used on a 70 regarding the underside. It looks like the steel was coated with something. Anyone have any ideas?
TIA
Pat

Posted by: 914werke Oct 12 2021, 08:05 PM

Rust

Posted by: bkrantz Oct 12 2021, 08:07 PM

Don't exaggerate. The factory used a salt water rinse.

Posted by: pek771 Oct 12 2021, 09:05 PM

Well, there is something in or on the underside panels, ie the floor pans. I scraped all of the old dirt and leaking fuel off...I took some scrapings outside and set them on fire. They burned. Anyway, Remember how the old time pots and pans were coated with something that made them shiny? Same sort of stuff, it seems.
The lack of rust on this tub is astounding.

Posted by: r_towle Oct 12 2021, 10:06 PM

Dealer undercoating
They came only pre-rusted from the long boat ride from the factory.

Posted by: SKL1 Oct 12 2021, 10:30 PM

Come on guys, I thought only Fiat used salt water based paint!!! Ask my college room mate who had a 124 spider!!

Posted by: 930cabman Oct 13 2021, 04:43 AM

Lets not forget the 850 spider. Many of our 914's were undercoated with a tar like product at the dealers, some probably have Ziebart. From what I understand the only protection from the elements was a heavy coat of paint.

Posted by: Superhawk996 Oct 13 2021, 05:48 AM

You mean seasoned cast iron pans?

Seasoned with lard, baked into the open grain structure of cast iron. Heated until the oils seeps into the metal and burns ever so slightly. Rinse lather repeat until the pores of the metal are filled with burt oil residue and things no longer stick to the cast iron.

Yeah, pretty much same thing used to coat 914 engines

Posted by: Quinn Moore Oct 13 2021, 03:31 PM

Tough crowd...I don't know what it originally was (tar, joke) I have some spots in the wheel wells that need touch up. Advice I received was.....get the loose stuff off (moisture gets in between...then rust), and hit it with "Wurth". Rubberized undercoating. There's other brands too. Got some rattle cans from Pelican.

https://www.pelicanparts.com/More_Info/WRTH88909071U.htm?pn=WRTH-88909071U&gclid=CjwKCAjwh5qLBhALEiwAioods2TcIfLcVUV4nWGCuS0KB8mOht_26w-FA34iEMc21AwUYb5eTFvw3BoCmSgQAvD_BwE

QM

Posted by: pek771 Oct 13 2021, 03:37 PM

Well, I determined (with the aid of ample drop lights and my glasses) that there is squat for undercoating. Evidently 40 year old fuel and dirt mix together to form some sort of coating like substance. I can remedy that.

Posted by: IronHillRestorations Oct 13 2021, 03:55 PM

The chassis were phosphate coated, primed, and painted. That’s it. Dealers and 3rd parties did some undercoating too. There was one contract hauler on the west coast that arbitrarily undercoated every new car they hauled, to pad the bill

Posted by: burton73 Oct 13 2021, 05:05 PM

Wurth’s RUBBERIZED UNDERCOATING PAINTABLE
The total underside and longs where coated with Tan Worth’s. PMB had a dolly at body shop to get the same amount of overspray the factory had. Not too much color in my case Cannery Yellow on this 1970 914-6 very early car 30th one down the production line. This helps when rocks are thrown up from the road

Bob B

Posted by: Jett Oct 13 2021, 05:41 PM

I removed the black undercoating using a combination of heat/scraping and carb cleaner. Worked well

Posted by: Jett Oct 13 2021, 05:41 PM

Lovely work!!

Posted by: raynekat Oct 13 2021, 06:22 PM

Porsche in the early days used a brown waxy product called cosmoline on all the 911's. Not sure about the 914's?

Posted by: tazz9924 Oct 13 2021, 06:58 PM

salt water

Posted by: Maltese Falcon Oct 13 2021, 09:48 PM

My 1974 914 came in at the Dealership all oversprayed with that Cosmoline underneath the car. Trans, engine case, axles + c/v's, trailing arms.You could write the mechanic a note on the valve cover with a fingernail

Posted by: Geezer914 Oct 14 2021, 05:39 AM

I under coated mine with Herculiner truck bead coating.

Posted by: barefoot Oct 14 2021, 05:54 AM

My 76 has waxed stuff in the doors, assume it was factory.
Had black undercoating that came off rather easily to expose nice red paint under

Posted by: Mikey914 Oct 14 2021, 09:53 AM

I have a thread showing the factory PVC coating. I was confused when I found it.

http://www.914world.com/bbs2/index.php?showtopic=324925&hl=Pvc+undercoating


Attached thumbnail(s)

Posted by: pek771 Oct 14 2021, 10:03 AM

Everything in the military was coated with cosmoline. There is some other stuff Porshe used on magnesium to protect it, which I think is a cousin to cosmoline. I have neither, but it is getting cleaned from to back I want to get this tub cleaned and remove the spots where water hides...like in the pedal assembly. Then I can coat it with Second Skin and undercoating.

I'm also going to mix in some microspheres with the Second Skin Acoustic stuff, for some additional sound deadening and thermal insulation

Posted by: Mikey914 Oct 14 2021, 01:01 PM

Post 165


http://www.914world.com/bbs2/index.php?showtopic=298851&st=150


Attached image(s)

Posted by: targa72e Oct 14 2021, 08:30 PM

This is the floor of my 73 which I believe is very original. The underside of this car looks to be very factory.



Cosmoline in other areas, light brown does not come off with soap and water but will with brake cleaner



No undercoating in wheel wheels on this car.



john

Posted by: pek771 Oct 14 2021, 10:07 PM

Thanks Mark, That is what is on the bottom of the 70.

Posted by: bbrock Oct 15 2021, 07:57 AM

Tectyl - I put it on my engine and transmission after rebuild. Very much like cosmoline. It melts and "flows" when the engine and trans are hot and then resolidfies into a waxy coating when they cool down. I thought it would burn off int he first thousand miles but it is still there after 2,500.

Posted by: davep Oct 15 2021, 08:05 AM

The PVC undercoating was an option, and most often specified for Canadian cars or those in the northern US states. The PVC was a thick undercoating, and applied before painting.

Posted by: mate914 Oct 15 2021, 08:42 AM

The company Called "U-POL" makes the stone guard for Wurth. They make a lot of products. I used the stone guard they have then painted over it. Made right hear in PA.
Matt

Posted by: Jett Oct 15 2021, 10:06 AM

My 06 M3 had it slathered on from the factory, found out because it was dripping on the garage floor

Posted by: mlindner Oct 16 2021, 05:36 AM

My painter shot it with Bed Liner, not a factory look but I like it.

Posted by: Mikey914 Oct 21 2021, 10:52 AM

We did the bedliner, but it was tintable. Did the same color as the car. Now just need to finish the assembly.

Posted by: roblav1 Oct 21 2021, 02:43 PM

Wurth USA website doesn't show a tan color. I found only black or gray.

Anyplace else for tan paintable rubberized undercoating?

Posted by: burton73 Oct 21 2021, 03:10 PM

I got a bit of it from AA ( George) back in 2010 or so.
All I can say is the factory put a shit load on my 6.

Bob B

Posted by: roblav1 Oct 21 2021, 05:27 PM

Mine too, built Apr 1970. Thanks, I'll check with George.