When a metal component needs colour and corrosion protection, the two most common finishing methods are powder coating and wet (liquid) paint. Both achieve the goal of applying a protective layer, but they differ significantly in durability, process, cost and environmental impact. Here is how they compare.
How Each Process Works
Wet painting applies a liquid coating — typically an enamel, epoxy or polyurethane — using a spray gun, brush or roller. The coating air-dries or is force-dried in an oven. Multiple coats are often required (primer, colour coat, clear coat) with drying time between each.
Powder coating uses a dry thermoplastic or thermoset powder that is electrostatically charged and sprayed onto the grounded metal part. The charged particles cling to the surface, and the part is then cured in an oven at 180–200°C. The heat melts the powder into a continuous, uniform film that chemically bonds to the substrate.
Durability
Powder coating produces a finish that is significantly harder and more resistant to chipping, scratching, fading and chemical exposure than most wet paint systems. A well-applied powder coat on properly prepared steel will typically last 15 to 20 years in exterior conditions before requiring maintenance, compared to five to ten years for a standard wet paint system.
In high-wear environments — industrial machinery, playground equipment, outdoor furniture — the difference in longevity is especially pronounced. Powder-coated parts withstand daily abrasion that would quickly degrade a painted surface.
Appearance
Both methods can achieve excellent visual results, but they have different strengths. Wet paint excels at producing very smooth, high-gloss automotive-grade finishes and allows for blending, colour matching and touch-ups on site. Powder coating offers consistent, even coverage with no drips, runs or sags — and the range of available textures (wrinkle, sand, hammer-tone, matte) is broader than what is practical with liquid coatings.
Colour matching between powder and wet paint can be tricky, so if a project involves both processes (e.g. site-applied touch-ups on powder-coated steelwork), this should be discussed early in the planning stage.
Environmental Impact
Powder coating generates virtually no volatile organic compounds (VOCs) because there are no solvents in the powder. Overspray is collected and recycled, reducing waste to near zero. By contrast, wet painting releases VOCs during application and drying, requires solvent-based cleaning of equipment and produces liquid waste that needs careful disposal.
For projects with sustainability targets or those located near sensitive environments (schools, hospitals, waterways), powder coating is the environmentally preferable choice.
Cost
On a per-part basis, powder coating is often comparable to or slightly more expensive than a single-coat wet paint application. However, when you factor in the reduced need for primer coats, the elimination of touch-up labour and the extended maintenance-free lifespan, the total cost of ownership over 10 to 20 years is usually lower for powder coating.
The main cost disadvantage of powder coating is the oven size limitation. Parts that exceed the oven dimensions cannot be powder coated and must be wet painted on site. Our curing oven accommodates parts up to 6 metres long, which covers the vast majority of fabricated components.
When to Choose What
Choose powder coating when durability, consistency and environmental performance matter — which covers most structural, architectural and industrial applications. Choose wet paint when you need on-site application, automotive-grade blending or are working with substrates that cannot withstand oven temperatures (certain plastics, timber-metal assemblies).
Our Recommendation
For metal fabrication projects on the Gold Coast, powder coating is the default choice at Committas. It pairs naturally with the fabrication process — parts move from the welding bay to surface preparation to the coating line without leaving our facility. If your project has specific requirements that favour wet paint, we can advise on the best approach.