WHAT IS UNDERCOATING?
Undercoating is a protective layer applied to the underside of a vehicle, its most exposed and least seen surface. It guards the steel against road salt, moisture, and stone chips. We use the Dinitrol line of coating products, world renowned for restoring and protecting vehicles. Which package your vehicle gets depends on its age and condition, and we decide that after we look at it.
UNDERCOATING OPTIONS
Two Dinitrol packages, chosen by how your vehicle lives. We recommend one after we see the underbody, not before.
Clear Protection System
Dinitrol 4010 Clear
A clear corrosion protection wax for new or well-maintained vehicles. It seals the underbody without changing how it looks, so factory finishes stay visible. The right call when you want protection in place before salt gets its first real shot.
2 Layer Protection System
Dinitrol ML+4941 Black
Our maximum protection package. Dinitrol ML creeps into cavities, seams, and box sections where rust starts unseen. Dinitrol 4941 then covers the exposed underbody with a tough, wax-based film. Built for salt, brine, gravel, and vehicles that work hard.
Dinitrol ML+4941 Black
Dinitrol ML creeps into cavities, seams, and box sections where rust starts unseen. Dinitrol 4941 then covers the exposed underbody with a tough, wax-based film.
- Excellent salt resistance (2000+ hours)
- NATO spec
- Tack free, and repels water
Drag to compare
APPLICATIONS OF UNDERCOATING
Daily Drivers
Trucks & 4x4s
New Vehicles
Classics & Restorations
Fleet & Work Vehicles
ADVANTAGES OF RBSD’s UNDERCOATING
Cleaning first is what makes the coating worth doing. Here is what you get out of it.
Longer Component Life
Brake lines, fuel lines, fasteners, and floor pans last longer when salt comes off and the metal is sealed against moisture.
Stone & Debris Shield
The 4941 film adds an abrasion-resistant layer that absorbs stone chips and road debris before they reach the metal underneath.
Corrosion Protection
Removing salt and chlorides before coating prevents corrosion from continuing under the film. That is why we clean first, every time.
Quieter Ride
Dinitrol 4941 is a thick film with sound-dampening properties, so many drivers notice slightly less road noise with the ML + 4941 package.
OUR PROCESS
Clean. Restore. Protect. Preserve. One visit, in that order.
Clean
Wheels, liners, and undertrays come off as needed for access, without a full teardown. We blast the underbody with solid CO2 pellets. Salt, grime, oil, and loose rust lift off. No grit, nothing abrasive driven into seams or cavities.
Restore
We inspect the bare metal, knock down remaining surface rust mechanically, and stabilize it with a rust converter. Exhaust, driveline, and other no-coat areas are masked off.
Protect
Dinitrol goes onto the clean, dry surface right away. No flash rust, no drying wait. Cavity wax first where specified, then the underbody coating.
Preserve
We check coverage under proper lighting, touch up thin spots, remove the masking, and reinstall everything that came off. Then we walk you through what was done.
WHY CHOOSE RBSD IN HAMILTON?
Anything metal, done right. That includes the metal you never see.
Since 2003
Decades of coating work in Hamilton. We know what road salt does here, and what holds up underneath.
Quality & Craft
Every underbody is dry ice blasted clean before any additional steps.
Top-Tier Service
Straight answers on which package fits and what undercoating can and cannot do for your vehicle.
Premium Product
We coat with Dinitrol, one of the best undercoating systems made. The product matters as much as the prep, and a cheap oil coat is not the same thing.
FREQUENTLY ASKED QUESTIONS
Turnaround, shipping, drop-off and how to prep your parts are answered on the full FAQ
100%! Ontario and Quebec spread more than half of Canada's roughly five million tonnes of yearly road salt, per Environment Canada. That salt collects in the seams and box sections where rust starts, and rust damage usually isn't covered by insurance. Cleaning the underbody and coating it is the part you can control.
Dinitrol is a European corrosion protection brand with decades of automotive use. We apply two of its systems. Dinitrol 4010 is a transparent protective wax suited to newer or well-kept vehicles. Dinitrol ML is a penetrating cavity wax that creeps into seams and box sections, and we pair it with Dinitrol 4941, a tough wax-based underbody coating, for maximum protection.
| Annual Oil Spray | RBSD Clean & Coat (Dinitrol) | |
|---|---|---|
| Approach | Thin penetrating oil sprayed over the existing surface | Dry ice clean, rust treated, then coated |
| Surface prep | Minimal by design | Salt, grime and loose rust removed first |
| Product | Light oil that stays fluid | Wax films that set and stay in place |
| Upkeep | Re-sprayed every year | Inspect every year or two, touch up as needed |
| Best for | A yearly maintenance routine | Longer-interval protection on clean metal |
The short answer: annual oil and clean-then-coat are different tools, and both beat doing nothing. We offer the second, because protection should start on clean metal.
It depends on exposure, mileage, and how the vehicle is washed and stored. Dinitrol systems are designed as long-term protection rather than an annual treatment, and that is how we treat them. We recommend an inspection every year or two so any thin or scuffed spots can be touched up.
Absolutely — this is the best time to coat and protect your car! No rust, clean metal, nothing to seal in. Our Clear Protection System uses Dinitrol 4010, a transparent wax that locks in that pristine condition without changing the factory look.
It takes a minimum of 4 to 5 days. Large or heavily contaminated vehicles can take longer. Blasting, rust treatment, masking, and coating each take real time to do right, and we will confirm the timeline with your quote.
