Just take it to a car wash and wash the underneath once a week.
Nothing beats continual and frequent rinse when it comes to road salt.
You will be amazed at what rinse would do to prevent rust if you plan to keep the truck down the road. Plus ,it’s a good leg workout.


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I like fluid film, because there's a lot to be said for a product that both extends protection over an already durable vehicle, but soothes our OCD in a way that's environmentally friendly.

Half of these other products do nothing, and are really freaking toxic for the environment.

The main reason Fluid Film is ideal is the exact same reason some folks here are against it. It doesn't create a hard seal, its Fluid, soaks into the metal, gets into every small space under the frame, inside the body, inside doors, inside engine bay, even on hinges and latches. Hard seals eventually form cracks and water gets into those spaces between the seal and the metal and rust starts underneith. Think about it, why would you want a waxy coating water can get trapped under and rust?! So, literally soak your 4Runner in Fluid Film and it will keep on protecting in those hard to reach places, often where rust starts. And it doesn't wash off those places either because there is no frequent contract with water. For the places that there is contact with water, like I stated before just generously reapply once or twice a year and occasionally lightly hand spray wash the bottom. Very easy...

Eastwood Tools makes several different types of anti rust products and applicators, I’ve used there products on several trucks(inside panels) applies easily with appropriate gun.

So I have rust inside my frame, it's flaking, but I've been throughout the whole frame with a ball peen hammer and haven't found any soft spots yet. What can I use to spray inside the frame to Stop or slow down the rust? I'm thinking motor or bar chain oil because I can't prep the inside at all other than with high pressure air or water. Any advice is appreciated.

Fluid Film

Corrosion Free is (according to a rigorous test evaluated by the Canadian military) the best rust proofing and prevention system. Go to their site and read the document. Also comes in buckets to spray with a spray gun and is starting to expand to local garages around the us

Will that soak into the rust or just sit on top of it?

It soaks into the rust and completely stops any further corrosion, yes. You can actually see it reacting with rust by bubbling and foaming when it makes contact.

be careful with what you put on there. Lots of oils will react with rubber and plastics. Fluid film is relatively safe, but still be cautious. While it says it is lanolin based, there is also a note about it containing petroleum distillates. Proper, careful application is key.

My initial undercoating (krown) warped my OEM fender flares VERY badly. They pulled away from the body. The 'L' shaped profile was no longer L shaped. I taped and re-taped them with 3M VHB tape, but in the end they were too warped to do anything with. I wound up putting bushwacker fender flares on, because it was cheaper than replacing the OEM flares with new paint. hindsight, I wish I had just replaced the OEM fender flares.

I use fluid film for touchups in the fall and I clean everything up with small amounts of rust paint in the spring. Continuous maintenance can keep the undercarriage rust-free. Don't go apeshit with oil in one large application, or you're going to get acquainted with all the door seals and rubber grommets under your vehicle that you never wanted to know about.

I visit the wash bays very often in the wintertime. The fluid film doesn't wash away easily. Get down there and spray that salt away as often as you can.

here's a picture of the original tape peeling away with a warped fender flare,
And then a picture of 3M's very high bond tape (used with the proper cleaning and 3M primer) peeling away.

plastics and oil do not mix! The Krown guy did a proper application on the fenders (this is where body rust is going to start) - but in the end, I wound up screwing around with these MF fender flares for months on end before I got the bushwackers. Learn from my mistake.

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After doing my research, and having been a previous Rust Check customer on my old Celicas, I decided to go with Corrosion Free rustproofing on my 2011 4Runner (that I bought used in May 2016).

Corrosion Free HEAD OFFICE Contact us to Order

Why Corrosion Free Rustproofing

Corrosion Free Rustproofing Application Video

I had the underbody "U" package that treats the frame, gas tank, fuel and brake lines, parking brake cables, and wheel wells.

It is a no-drip, eco-friendly application.

Man, that sucks. Sorry to hear and see that. I can’t imagine how much it would be for the oem painted fender flares. I had the dealer undercoat and rustproof my 4Runner before I picked it up. It was brand new. I heard mixed reviews about having this done, but they offered a lifetime warranty with it. I’m sure there’s some fine print when it comes to “lifetime” warranty!


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I’ve never used it, but read about Eastwood Internal Frame Rust Encapsulator. I guess it comes with a tube that you attach to the can and spray it inside your frame. It comes in black or green. It sounds like it might help you out, but I have no experience with it.


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Has anyone ever used corroseal and then frame paint to attack a frame that's already starting to rust? Everything i've read about it seems to be good.