KBS Coatings Cavity Coater with Wand, 16 fl oz Yellow — Low‑Viscosity Penetrating Corrosion Protection

KBS Coatings 75101 Cavity Coater with wand is a super-penetrating corrosion-inhibiting coating designed to protect enclosed metal cavities for years.

This ready-to-use 16 fl oz system combines a high-penetration protective fluid with an application wand to reach boxed frames, rocker panels, door cavities, fenders, tailgates and other hidden spaces where corrosion typically begins. Formulated to wick into seams and welds and to resist road salt, alkaline splashes and many chemical vapors, the Cavity Coater forms a self-healing film that extends corrosion resistance far beyond traditional waxes.

How does this product reach and protect hidden cavities?

The Cavity Coater fluid is low-viscosity and engineered to flow into tight seams, welds and small voids where primers and topcoats can’t. Applied with the included wand, it sprays and then wicks along surfaces, forming a continuous protective film that resists water and salts.

• Low-viscosity formula for deep penetration into seams and welds
• Flexible, self-healing film that maintains coverage after minor abrasion
• Wand fits into tight access points and directs product where needed
• Compatible with metal substrates commonly used in vehicles and equipment

What level of corrosion protection can I expect?

Independent salt-spray testing shows the Cavity Coater delivers very high resistance to corrosive environments—reporting over 4,000 hours in aggressive salt-fog exposure, which is multiple times better than conventional cavity waxes. While performance will vary with application and environment, the formulation is built for long-term protection in road and marine conditions.

• 4000+ hours salt-spray resistivity in testing conditions
• Resists road salt, salt water spray, and common alkaline exposures
• Designed for extended service life when properly applied and maintained
• Effective in both new builds and restoration projects to slow corrosion progression

How should I apply the Cavity Coater for best results?

Shake the can as directed, attach the KBS cavity wand, and spray into the targeted cavity until an even film forms. Work methodically from accessible openings and allow the product to settle and wick; re-apply in severe-damage areas or where prior corrosion exists.

• Attach wand and test spray pattern on a scrap area first
• Spray from multiple access points to ensure thorough coverage
• Let the product dry and re-inspect; repeat in missed spots
• Use in a well-ventilated area and follow all safety directions on the label

Will this work with other coatings and on different metals?

Cavity Coater is formulated to perform on steel and many other metallic substrates, and it complements existing primer and topcoat systems by protecting the cavities those surface coatings cannot reach. It resists common chemical vapors and alkaline solutions, but for best adhesion of external paints, avoid heavy overspray onto topcoats unless compatible.

• Compatible with most metal automotive substrates
• Designed to wick beneath areas where surface coatings don’t penetrate
• Resistant to many chemical and acid vapors that accelerate corrosion
• Works as a supplemental corrosion barrier, not a cosmetic topcoat

Who is this for: KBS Coatings 75101 Cavity Coater and Wand is aimed at automotive restorers, mechanics, fleet managers and DIY enthusiasts who need reliable long-term corrosion control in hard-to-access cavities. If you maintain vehicles, trailers, off-road rigs or industrial equipment and want a product that penetrates seams, resists salt and reduces hidden rust progression, this system is designed to extend the life of metal structures when applied as part of a maintenance or restoration program.