Coeur d'Alene Airport · KCOE · Hayden, Idaho
DINITROL · KSL Ceramic · Cavity Injection
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Two Approaches
Corrosion protection for vehicles driven through Spokane, North Idaho, and Eastern Washington winters. Both options start the same way — a dry ice–cleaned chassis, so the coating bonds to clean metal instead of sealing grime underneath it. Which one is right depends on the car and how you use it.
Corrosion protection for vehicles that live where the roads get salted. We apply DINITROL 4941 underbody coating in black or clear, plus DINITROL ML and 1000 cavity waxes injected into rocker panels, frame rails, doors, and box sections — the places rust starts where you can't see it. Applied over a dry ice–cleaned chassis, so the coating bonds to clean metal instead of sealing grime underneath it.
Supplier and installer of KSL Ceramic undercarriage coating, applied in-house at the hangar. Protects chassis, floor pans, and suspension components against road salt, moisture, and debris — for classics, performance vehicles, and daily drivers alike. The ceramic option when you want a harder-wearing surface finish than a wax-based undercoat.
Common Questions
Before the first brine application goes down, not after. Idaho and Washington both start treating highways as soon as the weather turns, and once salt is in the seams you're sealing over contamination instead of clean metal. Fall is the right window. If you've already driven a salted winter, we clean first and then coat.
Not the way we do it. The chassis gets dry ice cleaned first, so the coating bonds to sound metal instead of sealing grime and salt underneath it. Coating over dirty steel is how undercoating got its bad reputation. If there's genuine rot rather than surface rust, you need metalwork before any coating goes on, and we'll tell you that up front.
No, and you wouldn't want us to. Old undercoating has to come off, especially anything loose or flaking — coating over it just seals the failure in and traps moisture underneath. Dry ice cleaning handles this, and it can strip the original coating completely, which is what we prefer. Starting from bare, sound metal is the whole point.
Yes. DINITROL ML and 1000 are cavity waxes, injected into rocker panels, frame rails, doors, and box sections. That's where rust actually starts — from the inside out, where you can't see it. Underbody coating alone leaves those cavities untreated.
That's the best case — no existing corrosion, and protection goes on before the first winter instead of after several. It still gets a dry ice clean first. New undersides aren't clean undersides; there's grease, road grime from transport, and manufacturing residue on them, and coating over any of that means the coating bonds to the residue instead of the metal.
Black is the standard choice and what most vehicles get. Clear is for when you want to keep the original look of the underside visible — an original-paint car, a collector vehicle where the factory finish matters, anything where you'd rather see what's under there than cover it.
Plan on up to a week. That covers prep, cleaning, application, and curing time between coats. It isn't a same-day service, and anyone offering it as one is skipping steps.
DINITROL is a wax-based corrosion barrier. It stays flexible, tolerates flex and impact, and gets injected into the closed cavities where rust actually starts. KSL Ceramic is a harder-wearing surface coating for chassis and underbody. They solve overlapping problems in different ways, and the right answer depends on the car and how you use it. Ask and we will walk you through it.
Get In Touch
Phone
Location
Coeur d'Alene Airport (KCOE)
Hayden, Idaho
Service Area
North Idaho · Spokane
Eastern Washington · Western Montana