International Full Size Jeep Association

International Full Size Jeep Association (
-   FSJ-PRIS (
-   -   71 Original Undercoating? (

blakeusa 02-13-2020 08:26 PM

71 Original Undercoating?
Was wondering if anyone has replicated the OE undercoating on your trucks.

Primarily looking at redoing my bed underside.

I know the modern urethane bed liners are a better product but was going to spray mine with epoxy then apply some type (preferably near OE) over the epoxy.

Can't tell for sure if its an asphalt/ or rubberized based product.

Any feedback or results of what you used or would recommend would be appreciated.


Herk 02-16-2020 01:11 PM

My 71 just has asphalt undercoating in the rear wheel wells, and not too evenly applied. I think the front legs of the rear flares were coated with the same stuff.

joe 02-16-2020 03:04 PM

Odds are good it's an aftermarket coating. Out east it was likely Ziebart

Crankyolman 02-17-2020 07:28 AM

Mine is a '72 but I don't think they did anything different in '72 than in '71. My undercoat seems to be factory, was everywhere underneath, except the frame and was even under the carpet and extends up the firewall inside the cab, which is what kept the floorboard safe for 48 years, It seems to be a rubberized coating and is thicker in the wheel well and side panels and inside the cab but was thinner under the floor of the bed. I haven't yet tried to duplicate it but somewhere I have some sort of spray on rubberized undercoating I have hopes for but haven't tried yet.

tgreese 02-18-2020 12:05 PM

As I recall, undercoating in that era was dealer-applied. As I remember, the cars wouldn't even be painted on the underside - just plain e-coat underneath. There may be spray-on sound deadening on the interior.

Crankyolman 02-18-2020 05:40 PM


Originally Posted by tgreese
As I recall, undercoating in that era was dealer-applied. As I remember, the cars wouldn't even be painted on the underside - just plain e-coat underneath. There may be spray-on sound deadening on the interior.

My truck has body color paint (copper tan) underneath the under coat, it was fully painted top and bottom, and like I said it's everywhere but on the frame and appears to have been factory applied before the body and bed were installed since the bolts and the rubber pieces between the bed and the frame were not covered in it. If a dealer applied it they did a hell of a job.

As far as inside the cab I can't tell the difference between what's under the bed and what's inside the cab. It may be dealer applied sound deadening but they would have had to pull out all the firewall insulation and some other stuff as well as do a whole lot of masking to keep it off what it isn't on.

Maybe the original dealer for my truck just went above and beyond what any other dealer may have done but to me it seems rather unlikely that it would be where it is the way it is unless it was done at the factory.

rang-a-stang 03-04-2020 06:24 PM

Mine is factory undercoated with rust. :thumbsup:

PNW69Waggy 06-09-2021 06:21 PM

My '69 is undercoated with a textured asphalt based product all over the entire frame and body mount brackets, floorpans, wheel wells, and the underside of the gas tank. They seem to have done a very good job keeping it off the suspension and drivetrain considering everything else is coated. Does that sound like a factory job or dealer/aftermarket?

The undercoat has done a great job adhering to and protecting the floorpans.... too bad they completely rusted out from the inside. However on the frame it's flaking off in sections. There is black paint under the undercoat although in many areas that's coming off too and showing some minor surface rust.

Once the rusty floor pans are replaced I plan to undercoat them again, more for NVH reasons than anything else. I'm not sure what product to use yet either and I'm wondering if I should put down catalyzed paint as well before undercoat or if 1-2 good coats of epoxy primer will be enough. If anyone has any product recommendations for undercoat let me know. I figured I'll just talk to a local paint supplier and see what they suggest. My frame, axles and suspension I just want to paint with some good, durable black 2k paint, also open to any recommendations there. Since I have compressed air I can spray both with the appropriate gun rather than using aerosols, that way I can use good 2k products where appropriate, also more cost effective for doing a larger area like an entire Wag floor or under a pickup box. Although, probably worth saying I think there are some OK aerosol undercoats out there if someone is just doing a small area.

goldhammer 06-11-2021 01:52 PM

Asphalt based undercoating is probably not going to be available. Rubberized undercoating is under several labels, like Kent, SEM, and big auto parts brands like Napa.

If starting with clean metal, or can get the loose stuff off, you can hit with very coarse sanding and use some kind of user applied bed liner like Bondo, Hippo, etc brands. Won't have the durability of the hot applied and spendier applied products of the major types like pro-line, etc.

All times are GMT -6. The time now is 02:16 PM.

Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.