My main question has anyone sprayed something underneath that caused damage and should avoid? I know not to spray my exhaust, brakes and rotors. I’m just curious on stuff like brake lines, aluminum, rubber anything, gas tank, plastic?

I spray it on my battery terminals, lawnmower parts, boat outboard parts, ect... I’ve never had it harm anything. It’s not too hard to clean up when you want to work on something.

They have a FAQ on their site that suggests it’s fine on most paints, rubber, ect...

FAQ | Fluid Film

every bolt and nut i put it on started rusting 4 months later, things that never used to rust do now, I don't use it anymore, animal fats contain salt

I don't think its meant for long term use, im switching to Parkerizing

I’m only familiar with parkerizing in how it’s used on guns, how would you manage to parkerize the underside of a vehicle?

I haven't had a problem with it rusting things. That's interesting. Anything possible though.

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Very few things will react with fluid film. Weather strip rubber can if soaked in it can.




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Its more like cold black oxide than parkerizing, it comes in aerosols

my hub wasn't rusty 4 months ago when i put some fluid film on it, I do live next to a brackish river by the ocean with high humidity, but I don't drive in saltwater and no road salt here

So like acid in a spray can?

I use Ospho or Corroseal as a rust treatment, then paint or coat of some type. They both use acid to make magnetite out of the rust.

Ospho is thin like water. It will dissolve light rust and turn heavier rust black. It doesn’t seem to harm paint or plastics. I wouldn’t put it on electrical stuff.
They claim it dries, but I don’t see that or use it that way. I just keep the area damp for a few hours and then let set over night. Then wipe off with lint free cloth.
I use Ospho primarily for light rust and pretreat of raw steel.

Corroseal is thicker, kind of like paint. It turns rust black and coats it. It’s good for undercarriages and stuff you don’t need to be smooth.

I haven't tried anything yet, I was trying to nuts, bolts,screws.

Where is the fluid film? That hub looks dry.

I didn't lay it on thick just rubbed it around with a paper towel, probably didn't like heat and centrifugal force

I read your first 2 posts and didn’t bother to respond. I thought they were over the top sarcastic. Fluid film causing rust and then electroplating a car.

Now wiping fluid film on running gear with a paper towel.

I’m out.

Oh I didn't doubt you have rust. High humidity and salt air can cause oxidation.

I just never heard of FF having salt in it or made from animal fat.

I know I put FF on rusty steel and it dosent get any worse and I haven't seen oxidation being caused by it. I seen FF wear off and start rusting where is gone

Wheel well and axle areas it's going to wash away.

Going to need a different solution then FF in your wheel area. As I am heading to cosmoline type solutions for my wheel area.


As I know it only last a month or 2 at the most in wheel wells as I been monitoring that on my experimental rig.

The wheel wells are basically getting power washed every time it rains. So it dosent last long in that area of the rigs.



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