Cavity Coater - Cavity Wax - Corrosion Inhibiting Coating

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Cavity Coater - Cavity Wax and Corrosion Inhibiting Coating

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Cavity Coater is the perfect solution for hard-to-reach areas that are prone to rusting! Cavity Coater is a single step, super-penetrating corrosion inhibiting coating designed for long term protection on all metal surfaces. Cavity Coater provides a self-healing film which provides incredible rust protection on hard to reach areas.

Cavity Coater Application Directions➔

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Cavity Coater Overview

Cavity Coater is a one-step, super-penetrating corrosion inhibiting coating (CIC) for long term rust protection on all metal surfaces.

Cavity Coater provides a self healing protective film which renders over 4000+ hrs salt spray protection (an industry test that means Insane Rust Protection) ...over 4 times the protection of conventional cavity waxes.

Use Cavity Coater Aerosol with a KBS Cavity Wand to give simple, long lasting protection for those hard to reach enclosed cavities such as rocker panels, boxed frames, inside doors & fenders, deck lids, tailgates...and more.

Click HERE to Get Answers To Your Questions KBS Coatings Is Proudly Made In The USA!

Cavity Coater Video Overview

Cavity Coater Features

Insane Rust Protection - 4000+ Hrs Salt Spray Test
Creeps into Welds & Seams
Wicks & penetrates where primers and topcoats cannot get
Water Displacing
No Cracking or Flaking to -60°F
Self Healing
Easy Application
Ultra Long Lasting

Multi-Surface Uses
Forms Capillary Action
Lubricating properties
Minimizes parts replacement costs
Enables faster dis-assembly when repairs are needed
Protects against carbon fusion
Resists alkaline solutions, most chemical & acid vapors, road salt, steam, salt water.

Cavity Coater Applications

Automotive: Boxed frames • Rocker panels • Inside doors • Inside car & trailer frame rails • Windshield cowls • trunk lids • Hoods • Inside A-Posts • Inside B-Posts • Inside front & rear fenders & Inside tailgates • Back sides of bumpers • Weld seams (Wicks into welds & seams) • Insulating between unlike metal surfaces • Use wherever a typical cavity wax would be used.

Anti-Seize/Anti-Corrosion: Nuts, bolts & screws • Shafts • Pipe fittings • Gaskets • Press fit assemblies • Valve assemblies • Taps & drills • Pump mountings • Packing glands • Chain drives • Metal fittings • Machinery

Cavity Coater Coverage

Aerosol of Cavity Coater will coat 125 sq. ft. @ 1 mil thickness.
Quart of Cavity Coater will coat 200 sq. ft. @ 1 mil thickness.
Gallon of Cavity Coater will coat 800 sq. ft. @ 1 mil thickness.

Cavity Coater Physical Properties

Color: Light Amber
Corrosion Resistance ASTM B-117: Greater than 4000 hours on Steel
Compatibility Cd, Mg, AI: Pass
Low Temp Flaking: Pass
Penetration: BMS 3-23F pass
Water Displacement: 0% Rust
Water Resistance: Pass
Effect on Paint: None
Effect on Non-Ferrous Metals: No pitting.
Water Replacement: Displaces water on all metal surfaces

Cavity Coater - Cavity Wax

Directions & Information Pages

Cavity Coater Articles

👉 Cavity Wax Provides Rust Protection in Hard-to-Reach Areas

👉 How To Attach The Cavity Wand to KBS Cavity Coater Aerosol

👉 How To Prepare Metal Before Body Work To Prevent Future Rust

Cavity Coater - Application Video

Cavity Coater Application Video

Cavity Coater Aerosol - How To Attach Cavity Wand

Cavity Coater Aerosol - How To Attach Cavity Wand

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Gives me confidence

In restoring a very rusty Dodge Ramcharger, the cavity coater gives me a lot of confidence that I’m protecting the work I’m doing. With the wand, the cavity coater applies easily in the most difficult places to reach. I like how it solidifies and creates a barrier on the metal.

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Reviewed by: Darrell Flannery from Paris, KY on 1/19/2026

KBS works

I used the frame coater on a MG 4 years ago and followed up with the cavity coater. It is just a solid today as when I applied it 4 years ago. I just received 3 more cans of cavity coater for my 1984 c10 and plan on using it as soon as the weather warms up a little. KBS is the best.

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Reviewed by: Michael from Norfolk Virginia on 1/19/2026

Easy to apply

I used the spraying kit you sell and made to entire job a breeze to do and great coverage

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Reviewed by: Tom from Chicopee, MA on 1/10/2026

undercoat gun and wax

Worked great had no problems with it. I've needed one for a while, to keep the old VWs from rusting back out after I fix the rust spots.

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Reviewed by: craig from Plymouth IA on 10/7/2024

KBS Cavity Coater First Impressions

I strayed KBS Cavity Coater on exposed metal joints on my 40 year old hobby car. The nozzle sprayed where I aimed it. The product flowed into the joints. My first inpressions are good.

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Reviewed by: Michael T Moran from Baldwinsville on 6/14/2024

Cavity Coater

I used this for the first time at the end of August so it remains to be seen if it works or not. As for using it, the wand was plenty long enough. I used it on my pickup in the door jams, the bottom of both doors and the tailgate. It comes out a liquid and flows easily but the does setup like wax. I gave the rating I did because it hasn't gone through a Wisconsin winter yet otherwise it is easy to use, it will drip out everywhere it can so if you have a new driveway you want to protect it. I have used KBS products before so I have confidence this will do the job.

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Reviewed by: Ken from Racine,WI on 10/12/2023

kbs coater

Product worked as advertised, Will purchase again

Did you find this helpful? 1 of 1 Found Helpful

Reviewed by: Douglas Jennings from Shavertown Pa on 4/9/2023

1970 olds 442

great product lays down smooth with a brush

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Reviewed by: eric t knisley from BAINBRIDGE on 1/27/2023

Great product

Inexpensive and does exactly what I want. It was a corrosion/rust preventive that you spay all the drain locations of the doors, trunk, hood and remaining body locations. Look at how to use it including YouTube etc. Keeps my new car from rusting for years and years. ????????

Did you find this helpful? 1 of 2 Found Helpful

Reviewed by: Scott Gardner Design, Inc. from East Bethel, MN on 11/16/2021

So Easy To Apply

When I started thinking about coating my frame I was concerned with the inside thinking that even I coated the outside of the frame the inside would still rust. Found this. So easy to apply and I liked being able to see if weep out when the entire inside had been coated well. High Recommend.

Did you find this helpful? 1 of 2 Found Helpful

Reviewed by: Fred T from Cleveland, OH on 2/26/2021

Cavity coater

Purchased three aerosol spray cans over the years. One can came out foamy did not cover well the other two worked great. Assuming it was just a bad mixture.

Did you find this helpful? 2 of 4 Found Helpful

Reviewed by: Chris from Kalamazoo on 9/18/2020

Rust repair

I’ve used several KBS products to repair rust on my Silverado and have been very happy with them so far

Did you find this helpful? 2 of 3 Found Helpful

Reviewed by: Steve from Ankeny, Ia on 5/12/2020

This stuff works!

Looked at many rust prevention coatings on the market both on line and the auto stores, this coating by far is the best. The ability for the coating to creep and flow into tight areas before turning viscous is what makes this product work. Used this on a 3"x2" box style frame Shorelander boat trailer after repairing some rusted out sections. The extended wand allowed for a complete coating on the inside of the frame along the entire 24' length using the wiring holes in the trailer.

Did you find this helpful? 4 of 5 Found Helpful

Reviewed by: David G from New Berlin on 4/14/2020

Ends rust

excellant

Did you find this helpful? 1 of 2 Found Helpful

Reviewed by: THOMAS WARFEL . from Harlan on 3/12/2020

Great Solution

Great solution for hard to get t places. Recently refurbished the roof on my 1964 Mercedes 230SL. There was an "impossible to reach" channel in the back lower portion of the roof. The cavity coater was perfect for the job. I was unable to use the spray head provided but was able to plug the end with a toothpick and drill tiny holes in the tubing. Worked perfectly!

Did you find this helpful? 1 of 2 Found Helpful

Reviewed by: Thomas from Satellite Beach, Florida on 2/11/2020

Great product. Easy to use & goes a long way,

So far, I've used KBS Cavity Coater to treat the inner front fender cavities of a '98 Lincoln Town Car. Removing the headlights provided easy access points. I applied KBS Cavity Coater using the extra long wand and the application was fast, easy and painless. The product has a fairly pleasant smell. I chose to apply the product generously but have plenty left in the can to treat the bottoms of the doors and the inner rocker panels. I will likely order a second can for the inner rear quarters and inner frame rails as I plan to treat the entire car. Thank you for putting out a great product in the fight against rust.

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Reviewed by: Oliver from Staten Island,NY on 12/29/2019

Works great

Works great, one can did the entire frame inside. Have another vehicle to do with this great product

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Reviewed by: Oldplow from Ohio on 12/13/2019

Outstanding

Great product, have ordered it twice, shared with my auto body man and is likes it better that the other products he has used.

Did you find this helpful? 3 of 4 Found Helpful

Reviewed by: Lawrence Meggs from Roan Mountain, Tn. on 2/28/2019

Preventing rust beats de rusting and painting

I use this cavity coater on my boat trailer used in salt water. My first trailer (Galvanized steel) just melted with rust after 10 years. I spent $4,000 on a new Aluminum one and have coated this one Steel parts with this product and over the last 3 years I have extremely little rust. This cavity coater works for me.

Did you find this helpful? 3 of 4 Found Helpful

Reviewed by: Ed from Saint Rose, LA on 12/22/2018

Excellent customer service and fast shipping!

Ive purchase several of there products over last three years and all work excellent!

Did you find this helpful? 2 of 2 Found Helpful

Reviewed by: john Krucar from Scranton,Pa. on 10/30/2018

Works Great, Wand is Superior

This product works very well. I followed the directions as per System Sampler video on You Tube for fixing the pinch welds on my truck doors and tailgate. I may have used a bit too much, as I did have more weeping from the door drain holes, but the wand does provide far superior coverage than does the Eastwood Internal Frame coating (as I have used that product on a different application) and it cleans up easily. I am glad that I found KBS Cavity coater, and it will be the only product I will use of this type. I will be using this also on the lift gate of my SUV. This product is DEFINITELY the way to go.

Did you find this helpful? 6 of 6 Found Helpful

Reviewed by: Paul Borsari from Brewster, MS on 9/27/2018

Great product

Product works well. Be careful when pulling the plastic wand as it tends to disattach from the can. Other than that it worked great

Did you find this helpful? 4 of 4 Found Helpful

Reviewed by: Jonathan kraft from Annandale, va on 7/24/2018

product seems good

the product seems to work well but even with the large volume it's expensive

Did you find this helpful? 3 of 3 Found Helpful

Reviewed by: mike mathews from cameron, W.V. 26033 on 7/2/2018

Good Coverage

First time using Cavity Coater. Pros. Appears to have very good coverage with extension hose and spray tip. Only time will tell as to how effictive it is. Cons. Too expensive

Did you find this helpful? 1 of 1 Found Helpful

Reviewed by: John J from Alexandria, Va. on 1/2/2018

Woosh!

Boy this stuff comes out F-A-S-T, making a giant mess if there's any way for it to escape from the cavity. You can almost use it to hose down parts while you coat The up-side is, I was able to coat the outside of my parts too - using the leftovers I had to mop up with a rag. Don't take this wrong, I like the product, just wasn't prepared for the mess.

Did you find this helpful? 3 of 3 Found Helpful

Reviewed by: Chris E from Raleigh, NC on 12/14/2017

Q: Can I apply Cavity Coater into the back side of the fuse and relay panels under the hood to prevent moisture from causing corrosion in the connections?

Asked by: Jerry S - 1/18/2021

A: Yes, absolutely. You can spray the back sides of fuses and relays with Cavity Coater to prevent corrosion which commonly happen under the hood. That is an ideal application.

Please be sure to read thoroughly the Cavity Coater Directions and let us know if you have any questions.

Was this answer helpful? 2 of 3 Customer(s) found this Answer helpful.

Answer provided by: KBS Coatings (1/18/2021)

Q: Does Cavity Coater stop rust on internal cavities that already have rust? Thanks

Asked by: Oliver - 10/27/2019

A: Yes, KBS Cavity Coater is ideal for internal cavities that are rusty. KBS Cavity Coater will stop the rust from getting any worse.

Was this answer helpful? 1 of 1 Customer(s) found this Answer helpful.

Answer provided by: KBS Coatings (9/1/2021)

Q: Can I reuse the Cavity Wand or is the Cavity Wand a single use item?

Asked by: Dusty - 1/17/2021

A: You can reuse the Cavity Wand almost indefinitely.

After each use, simply flush residual Cavity Coater from the Cavity Wand by inverting the Cavity Coater Aerosol can and spraying for 10 seconds to flush Cavity Wand. If you do this, the Cavity Wand will be ready to use the next time it is needed.

Please be sure to read thoroughly the Cavity Coater Directions before you get started and let us know if you have any questions.

Was this answer helpful? 1 of 2 Customer(s) found this Answer helpful.

Answer provided by: KBS Coatings (1/17/2021)

Q: Can this product be applied with an undercoating gun? Like one designed for fluid film or related products?

Asked by: Robinson - 12/15/2019

A: Yes, Cavity Coater is applied with an undercoating type spray gun.

Was this answer helpful? 0 of 0 Customer(s) found this Answer helpful.

Answer provided by: KBS Coatings (9/1/2021)

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