Fluid Film has been protecting the bottom of my Jeep for Years. The way I prep and apply the product to the bottom of my Jeep usually takes about a days worth of work. To me, this is a small price to pay to prolong the life of my Jeep.

I would just like to start off by saying that there are a lot of different opinions on the best undercoating product and the best way to apply it. This is just how I do it and I have been getting pretty good results.

The first thing I do is remove all the tires from the vehicle I'm working on and put it up on jack stands. This step is not necessary but in my experience it makes accessing the bottom of the vehicle significantly easier and saves me a lot of time when I'm cleaning and spraying. 

Then like to take a pressure washer to the bottom of the Jeep. This does remove some of the previous years Fluid Film but I also off road my vehicle. Mud gets caked in every nook and cranny possible. All that mud holds moisture against all the components that I'm trying to protect. Because of this, I like to get all that off and start with a clean surface rather than spraying the new Fluid Film over top of all this dirt and grime. I want the rust protector as close to the surface that I'm trying to protect. If you pavement princess stays clean throughout the year, you could probably skip the cleaning part and just apply the new Fluid Film right overtop of the old stuff. Oh, and using the pressure washer gun without the long wand is the way to go! Just be sure to avoid any seals, bearings, calipers, etc...

Now that the big stuff is off the jeep, I spray down the entire underside with a product called LA's Totally Awesome Cleaner. I also scrub all the major surfaces using the Chemical Guys Brush. I don't go hog wild with this step, I'm mostly just trying to agitate the surface to break up what dirt is left. I take the pressure washer and spray the underside of the Jeep one last time. If you're not in a major rush, wait a day or so to let everything completely dry out.

Alright, It's now time to apply the fluid film. There's two ways to go about doing this. If you have access to an air compressor, I would highly recommend buying Fluid Film in either a gallon or 5 gallon bucket and using the Fluid Film Spray Gun. I have attempted using the cans to undercoat a vehicle and it's more costly, takes longer, and I wasn't able to cover as much. The spray gun does an excellent job atomizing the Fluid Film and spraying a nice even coat. The cans have more of a spray pattern than a fan pattern to them making them much harder to use. I have a specific purpose for the cans but, I'll get into that later.

Fluid Film does not expire but it does start to seperate over time. I purchased this bucket 4 years ago so it will require a quick stir before we put it into the spray gun.

To use the Fluid Film Spray Gun, fill the bottle with the product and screw it into the gun. I scoop the Fluid Film out of a 5 gallon bucket using a soda bottle I cut in half. It's not the best but it gets the job done.

I like to start off spraying the inside of the frame and all the nooks and crannies so, I would recommend attaching the wand first. The wand will screw into the tip of the gun. Depending on how far the wand is threaded into the gun will determine how much fluid film comes out of the nozzle. The further out the wand, the more Fluid Film comes out and the more the wand is threaded into the gun, less fluid film comes out. I like to test the spray pattern into a trash can before taking it over to the vehicle as it's not easy to see how well it is spraying once it is inside of your frame.

If you're using the cans, just replace the spray tip of the can with the tip and wand. There is no adjustments using this method.

Now we're ready to start spraying. Whether you're using the gun or the cans, the application process is exactly the same. Locate different openings in your frame, stick the want into it and down the frame as far as possible, pull the trigger to start spraying, and slowly pull the wand out coating the inside of the frame. I'll try to coat the entire frame and all the places where I know I won't be able to spray using the regular tip. Some of these areas are in the control arm brackets, shock towers, crossmembers, in-between the fuel tank and the skid plate, and the body mounts.

We can now take the wand off and switch over the gun or the can to the regular spray tips. If you're using the gun, adjusting the flow is the exact same as the wand. The further out the tip is threaded, the more Fluid Film will be sprayed. Everything else that can be easily reached can be sprayed now. You'll know if something is coated if it has a wet glossy look to it.

Here's where the cans come into play. The wand and nozzle for the cans is significantly smaller than the nozzle for the gun. This becomes pretty important when spraying all the doors and inside the fenders. Often the access holes are too small for the gun wand and the cans must be used. The insides of the doors don't get nearly as much water as the bottom of the frame does so I don't spray them every year. If this if your first time applying the product, this step is a must! Often the access holes are plugged off with plastic caps so these will need to be removed. I tend to break them so you may want to order some of these caps to replace the ones that break. Also, If you're spraying the insides of your doors, make sure your windows are up. If you windows are down and you spray them, you're going to have a massive mess to clean when you do go to roll those up. And when spraying areas such as the rocker panels, ensure you let off the trigger while the nozzle is still inside the hole. Don't accidently spray your interior.

That's about all there is to it! I like to keep a can of Fluid Film in the jeep with me during the winter so that if I notice any areas were water spray has taken the product off, I can touch it up right on the spot.

Just a heads up, if you sprayed Fluid Film on your exhaust it will burn off and smoke.

It may seem like a pain to keep reapplying this stuff every single year but the time and money you spend on your vehicle today will save you a lot more of time and money in the future!