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Is Cosmoline closest to GM frame wax? #4886653 10/03/18 04:58 PM
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LeakySeals Offline OP
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06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k ST HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #4886679 10/03/18 05:32 PM
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$37.50/quart?!?
HARD pass.

They must be selling it to the military.....


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #4886687 10/03/18 05:45 PM
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Not sure if its the same. But the product you linked to reads like asphalt sealer. Its mostly, 99%, just asphalt and solvent, thats it.


yup
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #4886705 10/03/18 06:14 PM
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If you want exactly what GM is recommending you use, have you ever looked at the products they mentioned in their frame rust TSB?

They say the rust should be treated using "Lloyd's Kryptonite Metal Treatment (P/N 36502) Life Long Rust Protection", then followed up with the black frame wax "Daubert Nox-Rust® P/N X-121B". If you're looking for a direct replacement of the black frame wax, the Nox-Rust is the way to go according to GM.


2015 Civic LX Coupe
Re: Is Cosmoline closest to GM frame wax? [Re: Jimzz] #4892659 10/10/18 09:17 AM
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Originally Posted by Jimzz
Not sure if its the same. But the product you linked to reads like asphalt sealer. Its mostly, 99%, just asphalt and solvent, thats it.

That must be the black RP-344. Its definitely not the thick version of Cosmoline (RP-342).


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k ST HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
Re: Is Cosmoline closest to GM frame wax? [Re: NoNameJoe] #4892668 10/10/18 09:21 AM
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Originally Posted by NoNameJoe
If you want exactly what GM is recommending you use, have you ever looked at the products they mentioned in their frame rust TSB?

They say the rust should be treated using "Lloyd's Kryptonite Metal Treatment (P/N 36502) Life Long Rust Protection", then followed up with the black frame wax "Daubert Nox-Rust® P/N X-121B". If you're looking for a direct replacement of the black frame wax, the Nox-Rust is the way to go according to GM.

Thank you!!! I purchased 3 cans of X-121B for the frame touch up, 3 cans of the RP-342 amber wax for the rest of the undercarriage. Now to figure out what to do with 8 cans of Fluid Film..


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k ST HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #4923027 11/13/18 12:50 PM
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Update. the X-121B is nice to get the black color. But as far as ease of use, how tacky the wax remains, I think the RP-342 is the better choice. It wicks into the tiniest places then sets up nice. Beads up, repels water, no soot. Connector friendly. i tried one that was coated and it wasn't stuck.

Removing Fluid Film chips, oil, and soot is still giving me fits trying to put this on..

20181107_100313-COLLAGE.jpg20181108_163654.jpg

06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k ST HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #4923890 11/14/18 10:23 AM
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What is the best place to get these products? I see the 342 on eBay but nothing else.


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Is Cosmoline closest to GM frame wax? [Re: buck91] #4924432 11/14/18 07:04 PM
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Originally Posted by buck91
What is the best place to get these products? I see the 342 on eBay but nothing else.


This is where I buy it. Just bought another 9 cans.
https://www.cosmolinedirect.com/cosmoline-rp-342-heavy-spray-military-grade-rust-preventive/

It has many useful purposes beyond the undercarriage. Like battery terminals..

20181114_120833.jpg

06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k ST HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #4924607 11/14/18 09:55 PM
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Is the Cosmoline that much better than Fluid Film? Looking to protect a Chevy Tahoe with a goodly portion of the factory wax long gone and surface rust well established but not BAD. Reading the Cosmoline website, the 342 DEFINITELY sounds like the better option with the 121 being more of a rubberized undercoat type product?


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #4924954 11/15/18 10:05 AM
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The oil in FF softens and degrades the GM frame coatings. If you contact FF they will tell you its not recommended for GM trucks with the factory wax coating (if thats actually what it is). So if you have any left, don't use.

Having used both, I think RP-342 is far superior to FF for undercarraige rust protection. The RP-342 is a special cosmoline wax. Meets govt specs. Thicker. tougher. Harder. But still self heals. It does cost more, but I have no doubt this stuff will last 5x longer than FF. Because its not a fluid. Its a wax. The nox-121b is a match to whatever that original coating was. its not as hard, stays tacky. Maybe thats the fluid film still haunting me. However the left over oil from FF has no effect on the RP-342. I still covers nicely, pretty hard. Only slightly tacky.


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k ST HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #4953624 12/16/18 07:53 PM
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I've been using Fluid Film for quite a few years and my 2002 vehicle has NO rust.
I do live in the rust-belt.

I have never used Cosmoline, but it looks interesting.
I just ordered a case of RP-342 (12 aerosol cans).
It was more expensive than other cosmoline manufacturers, but this RP-342 is Military Grade.

I think both Fluid Film and Cosmoline have a place for undercoating.
Fluid Film - Good for existing rust where it will penetrate thru the rust to base metal
Cosmoline - Individual parts being replaced, inside engine compartment, wheel wells etc
Can't have too many tools in the tool box.


2002 Ford Ranger
2 Wheel Drive
3.0 Liter Engine
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Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5020085 02/22/19 12:20 PM
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I've had zero issues using fluid film over GM factory undercoating wax. I think it does "soften" it but keep in mind, the wax undercoating on GM trucks becomes brittle, dry and cracks within months of ownership. The fluid film - as long as you're reasonably liberal with it - keeps it pliable.

But I will say I have used the Cosmoline stuff before and I like it better than fluid film...it's stronger, it doesn't wash away anywhere near as easily. Now I kind of wish I went that route instead of buying a five gallon bucket of the FF.

Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5020137 02/22/19 01:23 PM
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Originally Posted by LeakySeals

I just ordered a can - my part of California doesn't have as much air quality restrictions as SoCal, shipping kinda killed me but still.

I need to carry this out on a friend's car - Subaru won't do it since it's a CA car but Tahoe sees the same issues as the rust belt. Cosmoline would be even better than Fluid Film for this.
https://static.nhtsa.gov/odi/rcl/2014/RCMN-14V311-4153.pdf

Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5109421 05/19/19 04:13 PM
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Has anybody here used Cosmoline RP-342 and Amsoil HD Metal Protector? How do they compare in terms of thickness, drying time, etc? The Amsoil MP seems rather thin and leaves only a very thin film after drying.

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