What is this undercoating material, Not your normal rubber stuff |
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What is this undercoating material, Not your normal rubber stuff |
Mikey914 |
Feb 25 2018, 01:13 AM
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#1
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The rubber man Group: Members Posts: 12,649 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
So cleaning up the bottom of the car to assess the entire car, and found this material that looks like a light coat of primer. It has enough grime on it to be original.
My question to anyone that was around when these were coming out of the dealerships is; what is it, and what was it supposed to do? There is no rust so it certainly worked, but this was a Nevada car all its life. Mr Mayer perhaps you have an idea? Attached thumbnail(s) |
Mikey914 |
Feb 25 2018, 01:15 AM
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#2
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The rubber man Group: Members Posts: 12,649 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Another
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Mikey914 |
Feb 25 2018, 01:17 AM
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#3
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The rubber man Group: Members Posts: 12,649 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
More
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Mikey914 |
Feb 25 2018, 01:18 AM
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#4
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The rubber man Group: Members Posts: 12,649 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
One more
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914Sixer |
Feb 25 2018, 06:28 AM
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#5
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914 Guru Group: Members Posts: 8,872 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
It is PVC. That's what the factory was using to seal the cars with.
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gereed75 |
Feb 25 2018, 07:49 AM
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#6
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Senior Member Group: Members Posts: 1,241 Joined: 19-March 13 From: Pittsburgh PA Member No.: 15,674 Region Association: North East States |
To my understanding, the underside of the car was a rust preventative undercoat that everyone says is grayish PVC.
What are you using to remove the black undercoat that is over the PVC? |
SirAndy |
Feb 25 2018, 12:23 PM
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#7
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Resident German Group: Admin Posts: 41,610 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
It is PVC. That's what the factory was using to seal the cars with. (IMG:style_emoticons/default/agree.gif) |
Tom_T |
Feb 25 2018, 12:29 PM
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#8
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TMI.... Group: Members Posts: 8,318 Joined: 19-March 09 From: Orange, CA Member No.: 10,181 Region Association: Southern California |
Hey Mark -
I have to disagree with my esteemed fellow members on this, after both having been around back then (as was Mark/914sixer), & renewed research in recent years for my own 73's resto. The factory undercoating was similar to what was used on the valances & rockers panels (& on the black painted 73-74 steel bumpers), a heavy eggshell texture, which was then painted over in body color on the underbelly & wheel wells, & black at the rockers/valances/bumpers. The black spray-on coatings at the belly & wheel wells was a dealer applied "rust proofing" of varying reliability, & went by Zybart & a few other brand names (Zybart also had the drill-n-fill rustproofing too). Dealers would often do the spray coating on most/all cars without buyer request because it was quick & east to spray it on & most dealers had franchises with the suppliers, so that they could charge for it with 40-60% profit margin, but usually left the drill-n-fill to customer request because it was very time consuming & more expensive to do it. The black spray was basically like today's formulatiuons for the semi-rubbery rattle can & roll-on/spray-on underbody coating & bed-liners. My 73 914-2.0 had it put on before the original owner whom I bought it from even got the car, as well as having had 2 prior topside resprays from the factory L80E Light Ivory, first to Sahara Beige (like Steve's/smg - which the owner & I were unaware until I stripped some areas), then to the 72 Gold metallic when they & I bought it (OO only knew of the gold respray, but white was/is clearly visible on floor pans, etc.) - probably to try to sell it in better non-white colors. I always liked the "black-out" look in the wheel wells. It did protect my underside from rust here in SoCal, & 72-76 were what's now known as El Nino years too, & several while it was my & the OO's DD up to May 85. The underside rust which did form was due to window washer bottle & M/C leaks into the front trunk wells, & rusting from the inside down. You may recall the pix posted by Tod914 stripping the black coating off of his pristine Bahia 73-2L, & of Steve/smg stripping it off of his Sahara Beige when he got it. I think that their posts had some product(s), procedures & methods advice on how to clean it off best, & with least underlying paint damage. So I'd suggest a google search to read up more there. PS - To clarify - the gray stuff looks like it could be the body color paint worn off of the factory undercoating, but I was answering you about your question on the black stuff, which lies on top of the paint, then factory undercoating. Have Fun! (IMG:style_emoticons/default/beerchug.gif) Tom /////// |
SirAndy |
Feb 25 2018, 12:52 PM
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#9
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Resident German Group: Admin Posts: 41,610 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
I have to disagree with my esteemed fellow members on this ... The factory undercoating was similar to what was used on the valances & rockers panels This is not undercoating, it's a coat of grayish PVC. My '70 /4 has it. (IMG:style_emoticons/default/shades.gif) |
SirAndy |
Feb 25 2018, 12:57 PM
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#10
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Resident German Group: Admin Posts: 41,610 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
Just going to leave this here ...
PVC undercoating was a factory M-option, M640. This was applied before the paint, so you have to look for the orangepeel surface to know the paint is not is not on steel. Using a magnet, the attraction is weaker on the undercoated steel than on painted steel. Say, the inside and outside of a fender. Most Canadian cars have the PVC, and the heated rear window. The PVC is white and up to about 1/8" thick in some areas. It adds a fair bit of weight to the body. |
914werke |
Feb 25 2018, 01:42 PM
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#11
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"I got blisters on me fingers" Group: Members Posts: 10,034 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest |
So is it still available to apply for the concours guy or what is the a modern equivalent?
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Mikey914 |
Feb 25 2018, 02:48 PM
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#12
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The rubber man Group: Members Posts: 12,649 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Thanks Andy,
Definitely has a different texture. It doesn't seen to be a faded paint underneath, as its pretty uniform. My inpression is that it may have the PVC base coat, but also has a coating over the paint. I did try removing it in a small section and was able to het more color to show with a solvent. Mt search now is for the original material it was coared with on tbe outside. |
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