Mobile mining equipment painting: haul trucks, loaders and dump bodies

Painting mobile mining equipment starts with degreasing and blast cleaning to the right grade, masking every component that must not see abrasive or paint, then applying a system chosen for abrasion, impact and mine chemicals. The work is planned with the maintenance shop so that painting fits into a shutdown that is already scheduled instead of taking the machine out of service a second time.

Haul trucks, loaders, dozers, graders, drills and dump bodies work in one of the harshest environments a coating can face: mineral mud, acidic or salt-laden water, flying rock, frequent pressure washing, freeze and thaw. A poorly prepared paint job flakes after a few cycles, and corrosion attacks welds and hidden areas. This guide is written for fleet and maintenance managers in Quebec and Ontario. It complements our mining equipment painting page and our guide to mining equipment protection, which focuses on the processing plant instead.

Why does paint on mobile mining equipment fail so quickly?

It fails quickly because it faces abrasion, impact, constant moisture and washing all at once, often over incomplete preparation. Every chip leaves bare steel, and rust creeps under the film from that point.

The most common causes:

• Residual contamination. Grease, hydraulic oil and caked mud stay in corners. Paint applied over them does not bond.
• Untreated welds and edges. Weld beads, spatter and sharp edges hold a thin film that gives way first.
• Wrong system. A decorative topcoat over a light primer cannot survive a dump body loaded with rock or a frame blasted by mud.
• Missed recoat window. A coat applied too late over the previous one can delaminate. Recoat limits come from the product data sheets.
• Aggressive washing. High-pressure washing on a film that is too young or already cracked speeds up disbondment.

Which parts of a mobile machine need different treatment?

Each zone is treated according to what it faces: the dump body interior and impact zones need an abrasion-resistant system, the frame and undercarriage a thick anticorrosion system, the cab and hoods an appearance finish. The table summarizes common approaches.

For dump body interiors, a polyurea coating is sometimes preferred to conventional paint; our article on polyurea for bins and equipment explains when that choice makes sense.

How are parts prepared before painting?

Preparation always starts with thorough cleaning, followed by blast cleaning to the grade the chosen system requires. Skipping degreasing simply drives grease into the steel with the abrasive.

A typical sequence:

1. Washing and degreasing. Hot-water washing, then solvent or detergent cleaning per SSPC-SP 1. Oil deposits around cylinders and hubs need particular attention.
2. Inspection. Locate cracks, thinned areas and welds to repair before any paint goes on. A painted crack is still a crack.
3. Weld and edge preparation. Grind spatter, round sharp edges, repair porous welds.
4. Blast cleaning. Abrasive blasting when the machine is stripped or in the shop, to the specified grade (for example per ISO 8501-1). For local touch-up, power tool cleaning per SSPC-SP 3, SP 11 or SP 15 is often the only option; see our guide to power tool cleaning.
5. Dust removal and checks. Check residual dust (ISO 8502-3) and, in salty environments, soluble salts before the first coat.

Shop abrasive blasting is done with containment, abrasive recovery and protection of nearby equipment.

How are sensitive components protected?

They are protected by complete, documented masking before blasting, or by removing parts when masking is not enough. Abrasive that gets into a bearing or a cylinder costs far more than the paint job.

Components to protect first:

• Cylinder rods and hydraulic seals. Rigid sleeves or abrasion-resistant tape, and never paint on a chrome rod.
• Bearings, pins and grease fittings. Plugs and caps; grease fittings must remain reachable after painting.
• Wiring harnesses, sensors and connectors. Removed or bagged, labelled for reassembly.
• Glass, lights and cameras. Protective film and rigid panels.
• Nameplates and serial numbers. Masked so they stay legible.
• Mating surfaces and bolted flanges. Masked or treated as the equipment manufacturer instructs.

A masking list per equipment model, agreed with the shop, prevents omissions from one machine to the next. Lockout follows the site procedure (CSA Z460 is often the reference).

Which paint system suits mobile mining equipment?

The system is chosen by zone and corrosivity category, based on ISO 12944: a zinc-rich or epoxy primer, a thick epoxy intermediate coat and a UV-resistant polyurethane topcoat are the most common base. Thicknesses and the number of coats come from the specification and the data sheets.

Selection guidelines:

• Highly corrosive or salty environment. High-durability system in the upper ISO 12944 categories; our article on ISO 12944 paint systems details the options.
• Abrasion zones. Filled epoxy or a thick abrasion-resistant coating, with enough thickness to absorb the expected wear.
• Frequent touch-up. Prefer products tolerant of power-tool-prepared surfaces, so the shop can touch up between shutdowns.
• Colours. Fleet colours and safety markings are set at the start, to avoid an extra coat.

The complete system is part of our protective coatings offering, which remains Induscoat's core business.

How is painting coordinated with fleet maintenance?

Painting is coordinated by placing it inside maintenance shutdowns that are already planned, in sequence with the mechanical work: disassembly, repairs and welding first, painting next, reassembly last. Painting becomes one step of the work order, not one more interruption.

Useful coordination points:

• Shared schedule. Fleet planning shows which machines enter the shop and when; painting follows those windows.
• Sequence with welding. All hot work is finished before painting. Welding on a painted part destroys the film and releases fumes.
• Cure time. Time before return to service, handling or washing comes from the data sheets and is built into the work order.
• Space and ventilation. A dedicated bay or a temporary enclosure, ventilated and heated in winter, to meet application conditions.
• Records. Preparation, ambient conditions and dry film thickness logged per machine, to track the real life of the system.

Our project management service helps sequence these steps when several machines go through the shop during the same shutdown.

Where do we work and how do you get a quote?

Our crews and qualified subcontractors work from LaSalle in mining shops across Quebec and Ontario, including Abitibi-Témiscamingue and the North Shore. We work in the client's shop or in a temporary enclosure on site, depending on the equipment and the available window.

Pricing is on consultation: it depends on the type and number of machines, the condition of the existing paint, the preparation grade, masking, the selected system and access conditions. Send photos, equipment models and the shutdown window through the quote request: reply within 24 business hours.

Frequently asked questions

Can a dump body be repainted without full blast cleaning?

Yes, for local touch-up over paint that is still well bonded: degraded areas are power-tool cleaned, edges are feathered and a surface-tolerant product is applied. When rust under the film is widespread, full blast cleaning becomes the only durable option.

Does the equipment have to be disassembled for painting?

Not always. Sensitive components can be masked, but some parts (cylinders, harnesses, attachments) are safer removed than protected. The decision is made part by part with the shop.

Is paint enough for a dump body interior?

Not always. If the ore wears the coating quickly, a wear liner or a specialized thick coating is better suited than paint. The choice depends on the material hauled and how it is loaded.

How long is the equipment out of service?

It depends on preparation, the number of coats and the cure times in the data sheets, as well as shop temperature. The duration is set in the quote based on these factors.