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Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5111627 05/21/19 05:31 PM
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I used the Amsoil HDMP on my F150 the first winter after buying it used (with very low miles) a number of years back. Truck was basically rust-free before winter. After winter it had developed some very light surface rusting along the edges of the sheet metal in many places.

I switched from HDMP to Fluid Film and have had excellent results- but it does get reapplied yearly now.


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5128315 06/08/19 05:43 AM
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Trav Offline
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Next time try Noxudol.


ASE L1, Master. Deutsch Meisterbrief.
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5210272 09/11/19 02:44 PM
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LeakySeals Offline OP
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Update: Its been approx 10 months since the first application of RP-342. Including one winter. The rear wheel wells and everything in the area are the trouble spot for rust on this truck. Nothing rinses off under there. As stated before, my prior Fluid Film habit hampered the first application. Lots of oily soot, sand, and grit flaking off in chips exposing areas of rust underneath. Would appear its still an issue.

One area that still has minor FF flaking off. Still has soot clinging to the body. Same for the other side.

[Linked Image]
[Linked Image]

For the most part, the RP-342 held up pretty well. Used a pressure sprayer on low to get anything loose and reapplied. Decided to leave the rusted surface metal bare and coated it with nothing but RP-342. See what happens next year.

[Linked Image]
[Linked Image]

In summary there were a few spots that chipped off and some minor rust bled through, and thats probably my doing not getting all the FF off. But this time around was fast. Other than these areas the frame and undercarriage is clean.

I didn't reapply everywhere. The rear still holding up from the original application. Going to leave it alone.

[Linked Image]


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5234558 10/09/19 06:24 AM
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JHZR2 Offline
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Originally Posted by LeakySeals
Update: Its been approx 10 months since the first application of RP-342. Including one winter. The rear wheel wells and everything in the area are the trouble spot for rust on this truck. Nothing rinses off under there. As stated before, my prior Fluid Film habit hampered the first application. Lots of oily soot, sand, and grit flaking off in chips exposing areas of rust underneath. Would appear its still an issue.

One area that still has minor FF flaking off. Still has soot clinging to the body. Same for the other side. ]

For the most part, the RP-342 held up pretty well. Used a pressure sprayer on low to get anything loose and reapplied. Decided to leave the rusted surface metal bare and coated it with nothing but RP-342. See what happens next year.


In summary there were a few spots that chipped off and some minor rust bled through, and thats probably my doing not getting all the FF off. But this time around was fast. Other than these areas the frame and undercarriage is clean.

I didn't reapply everywhere. The rear still holding up from the original application. Going to leave it alone.



My understanding is that FF and GM frame wax do not mix - FF ruins the wax. FF is also prone to wash off quite easily. I use it on spots where wash is not an issue and it stays indefinitely, but I’m surprised that it with dirt and soot remained and got in your way.

The guys that apply waxoyl recommend a pressure wash of the undercarriage. Not a bad idea.

Now that you have a year on the cosmoline, is it soft and pliable/self-healing, or has it set up harder?

Re: Is Cosmoline closest to GM frame wax? [Re: JHZR2] #5235050 10/09/19 03:03 PM
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LeakySeals Offline OP
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It's the same. Harder when it's cold. On a warm day it's softer but doesn't flake off or anything like that. Definitely wear gloves it's tough to get off your hands. I can smell it a bit on warm days. And the best part is the surface stays clean. No soot. Just bought another case and a extension nozzle for the inside of the frame. I also plan to put it in the snowblower chute. I'm hoping it will make the surface slippery like fluid film but without the oil. [Linked Image]


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Is Cosmoline closest to GM frame wax? [Re: JHZR2] #5235074 10/09/19 03:33 PM
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LeakySeals Offline OP
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Looked great I thought (sorry about sideways, but bitog forced it this way)
[Linked Image]

But a few months later the mess began. This was the spring after a winter using FF. Flaking off with rust underneath. It appeared to me that all the necessary oil was absorbed by soot and sand.

[Linked Image]
[Linked Image]
[Linked Image]

And this is the 2005 purchased because it was "oil sprayed"
[Linked Image]
[Linked Image]
[Linked Image]


As you can see that's pretty much a disaster too. The dirt is so thick you can't even see where things are at work on. What a mess. So I can't switch it over to the wax until I get this off. So far the front is done



06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5235361 10/09/19 09:27 PM
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So one of the theories with “hard” coatings, which I’d include most semi-drying waxes to be, is that they do allow some level of moisture to diffuse in and under, allowing rust to continue.

I observed that with Amsoil HDMP on some bolts underhood of my Saab, when I tried it a few years back - rust started and grew under the wax.

Water will diffuse through wax and hydrocarbon, see:

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.496.3804&rep=rep1&type=pdf

and a bunch of studies of water loss and permeation through waxes in plants. It’s not fast, in fact it’s really slow, but it can happen, and I have to wonder if it’s even slower to diffuse back away from the metal once in there.

Ive always been hesitant to go with waxy coatings because of this. I’m less comfortable with them in high exposure areas. Possibly more ok with them in non wash and less exposed areas....

Re: Is Cosmoline closest to GM frame wax? [Re: JHZR2] #5235485 10/10/19 03:18 AM
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LeakySeals Offline OP
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Wish my thread had a new name like long term RP-342 Cosmoline results or something like that.

I don't know about other wax products, I'm only familiar with Fluid Film and RP-342 Cosmoline long term.

I first applied RP-342 Nov 2018. Just before winter. Used 6 cans. So far, rusting has paused wherever RP-342 has been applied. Its amber colored, collects no soot layer so you can see through it. Creates a patina on open rust spots. You know nothing is happening under the layer. Because you can see it. No chips or flakes like I experienced with FF.

Ive been monitoring this rear stabilizer bar bolt. First pic is 9 months after FF spray. Completely washed off.
[Linked Image]

The second is 10 months after RP-342. The surface just looks wet, patina is the best description I can come up with. Did not wash off. Water beads up and the undercarriage stays clean.
[Linked Image]

Also note on the axle where the Fluid Film flaked off. The RP-342 has created a patina on that as well. I did not retreat the areas this year.

Note: when it's real hot out I can smell it a little bit. Like its alive lol. I think its softer in the heat and moves around. Also I got some overspray on the exhaust. Took a month for that to burn off. So its flashpoint must be pretty high.


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5236606 10/11/19 05:42 AM
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buck91 Offline
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The Cosmoline has a very similar appearance to Amsoil HDMP. Does it dry or remain fluid?


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Is Cosmoline closest to GM frame wax? [Re: buck91] #5237765 10/12/19 10:23 AM
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LeakySeals Offline OP
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Originally Posted by buck91
The Cosmoline has a very similar appearance to Amsoil HDMP. Does it dry or remain fluid?

RP-342 is not an oil spray. It is military grade Cosmoline in a spray can. A wax. Used for decades by the military including WW II to protect weapons and equipment from the salt water and corrosion. Indefinitely.

My experience using it as an undercoating/rust proofer is it's fairly hard when it's cold out. But when it's hot out in the summer it's softer and will creep a bit. It seems to fill in and smooth out anywhere where it got scratched. But it never gets wet like oil. It was up over 100 F here a few times and I checked it. Was a little tacky but it wasn't wet. And oooo that cosmoline smell. Like I just sprayed it. But only when it's hot out.

It has other uses like battery terminals. Great luck so far with that no corrosion. No battery acid nothing on the experiment in the Maxima. Which has a history of corroding terminals I'm kind of surprised by that.

Next experiment is going to be the snow blower. Rather than coat the chute with fluid film I'm going to coat it with RP - 342 and see what happens. I sure hope it works because the stuff is not easy to get off.

Collectors of old military weapons curse the stuff. But IMO it's perfect for protecting the undercarriage and frame.


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5237769 10/12/19 10:26 AM
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LeakySeals Offline OP
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RP-342 is a thicker version of Cosmoline than what was on that rifle


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5237921 10/12/19 02:11 PM
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I was doing some work today and have my lamp pointed at the fender well. In addition to light it creates a lot of heat. I can smell the cosmoline in this area as it warms up. It's not obnoxious but I'm aware of it. Not wet. A little on the tacky side but not too bad. Same condition since the spring when I sprayed it. A satin amber shine. Nothing sticking to it. Looks like the light exposed the internals of the frame which I need to treat before the winter. [Linked Image]


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Is Cosmoline closest to GM frame wax? [Re: LeakySeals] #5240903 10/16/19 03:36 AM
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Amsoil has a decent undercoating spray. I think it’s also marketed as a motorcycle chain lube spray.

Smells like oil and blue cheese, but it works.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 195k M1 0w40 Mahle OX149D
97 Chvy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980

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