Spraying bulk Cosmoline?

[buck91]

I've seen a few threads espousing Cosmoline 342 for vehicle rust protection. Looks like good stuff, definitely direct competition with Amsoil HDMP that many like. Browsing their website and found they offer both RP-342 as well as RP-342 Black in bulk packaging. Has anybody sprayed this? I'm not sure if its thick enough to use my undercoating gun or if I would need more of a paint sprayer.

 

[Skippy722]

We used cosmoline a lot at the machine shop I used to work at, the stuff is pretty thick, if we didn’t thin it out we’d use paint brushes and paint rollers. When we would spray it we’d mix it with naphtha to get the desired viscosity and use a spray bottle.

 

[doublebase]

I can’t imagine how this stuff would spray in bulk, because even in cans (where it is cut with something to thin it out) it still sprays on thick. It’s like liquid wax. Love the stuff

 

[Doc8404]

Nope. Bought 24 cans and used 5-6. Run the truck through automatic wash 3-4 times a month and it’s still there.

 

[JTK]

Based on what I've read, you'd need an undercoating gun for it.

I don't think I've ever heard anyone complain about using it. It's about 2x the cost of something like woolwax, but if it hangs around 2x longer, it's worth it.

The only issue I have is fluid film or woolwax is a natural product where based on cosmoline's SDS, it's a hydrocarbon/petroleum product with 50-85% unnamed "customer supplied product". Not sure how the petroleum products would fare on soft parts the spray is going to get on.

 

[buck91]

Hmmm. I’d like to use the bulk so I can fog inside my boxed frame with my wands.

 

[wdn]

I use the Fluid Film aerosol. A few years ago I bought a case of 12 cans n eBay 11.75 ounces each, for $84.50 with a $5 gift card tossed in. It goes on right out of the can and sticks, there are some drips, but you would get that with an air gun too.

A couple years ago I did the whole frame and undercarriage with Corroseal paint that is holdng up well. You still need to do touch ups because that is more of a thick paint not an oil- or wax type product.

 

[2EHA]

5 gallon of fluid film. cheap and good enough

 

[doublebase]

I use the Fluid Film aerosol. A few years ago I bought a case of 12 cans n eBay 11.75 ounces each, for $84.50 with a $5 gift card tossed in. It goes on right out of the can and sticks, there are some drips, but you would get that with an air gun too.

A couple years ago I did the whole frame and undercarriage with Corroseal paint that is holdng up well. You still need to do touch ups because that is more of a thick paint not an oil- or wax type product.

The Fluid Film in bulk goes on much thicker, and lasts much longer. I use the Fluid Film in the can for body cavities and tight spots. That’s just my experience, sounds like it’s working good for you though.

 

[gerard143]

Fluid film comes off way easy. Cosmoline is a wax you can pressure wash for 30 min straight and it doesn’t come off. Fluid film is a joke compared to cosmo.





To answer the original question….you can also easily spray it. See here.

 

[Doc8404]

I have about 18 cans left of RP342. Late in the season but spraying soon.

 

[gerard143]

I ordered a gallon of black. I’ll be spraying soon with automotive style gun. Upstate NY. Brutal road salt winters here.

 

[Doc8404]

I ordered a gallon of black. I’ll be spraying soon with automotive style gun. Upstate NY. Brutal road salt winters here.

What’s upstate?
Like Westchester? LOL.


Oneida county here.

 

[gerard143]

Syracuse. Snowiest city in the country lol.

I frequent tug hill regularly in the winter for snowmobiling. They’ve seen like 12 feet of snow in 24 hours lol.

 

[Doc8404]

Syracuse. Snowiest city in the country lol.

I frequent tug hill regularly in the winter for snowmobiling. They’ve seen like 12 feet of snow in 24 hours lol.

I ride ATV on Tug

 

[LeakySeals]

I know from experience cosmoline does not play well with vehicles that have established oil spray and are build up with soot. But what if I blend them from scratch? Will the FF hold up better? Will the cosmoline creep better? I'm going to find out on one of my $500 cars. One side cosmoline on first then FF before it dried. The other side is the opposite, FF on 1st. See what happens.

 

[buck91]

Fluid film comes off way easy. Cosmoline is a wax you can pressure wash for 30 min straight and it doesn’t come off. Fluid film is a joke compared to cosmo.





To answer the original question….you can also easily spray it. See here.

true. I waas using a striff scrub brush and simple green on my spare tire/wheel today and it barely made a dent in the coat of RP342. That said, I feel the effectiveness of its rust prevention IS quite a ways behind a properly reapplied fluid film treatment based on my experience.

 

[RooflessVW]

Heat it up and use a Harbor Freight paint sprayer.

 

[LeakySeals]

I know from experience cosmoline does not play well with vehicles that have established oil spray and are build up with soot. But what if I blend them from scratch? Will the FF hold up better? Will the cosmoline creep better? I'm going to find out on one of my $500 cars. One side cosmoline on first then FF before it dried. The other side is the opposite, FF on 1st. See what happens.

The answer to this was they kinda can work together, depending on the order that they are applied. You cannot spray cosmoline wax over the top of fluid film or woolwax. You can spray fluid film and woolwax over the top of cosmoline, but it changes the behavior and consistency of cosmoline. It becomes thinner so it may penetrate better. But it’s not as durable and it doesn’t really harden in the winter so it picks up a lot of soot and sand. It doesn’t last as long before needing a touchup. So it’s better to use one or the other depending on the level of rust. If you have a new or newer vehicle with limited surface rust, cosmoline is definitely the way to go. Less work. Less touchups. Cleaner undercarriage. I’ve gone almost 5 years without touching up one of my vehicles and it’s been out every winter in the salt. If you have significant surface rust with flakes and the vehicle has only a few years of life left, woolwax is the way to go. Better penetration is required. Touchups every year before winter.

 

[LeakySeals]

Heat it up and use a Harbor Freight paint sprayer.

If someone really wants it off spray some type of oil or solvent like for example, WD-40. Sometimes I get it on connectors. Just spray that to loosen them up and wipe it off. It’s not really a big deal.

Also, I’m not using RP– 342 anymore. I don’t like the new spray nozzle. Past 3 years I’ve been using CRC 06026 Heavy Duty Corrosion Inhibitor. It is a thinner cosmoline, but it sprays better. Just add a second coat. It’s cheaper, you can get it by the six pack off Amazon for around $50. I used this on a 2019 Jeep Cherokee 3 years ago. Every summer, it creeps and fills in any areas that were bleeding. I have enough to give it another coat, but it really doesn’t need it.