A Reliable Finishing Partner for American Metal Stamping Companies

Stamped parts often move through fast, high-volume programs with tight deadlines. A dependable coating partner helps you keep those programs on track.

Winona offers powder coating, E-coating, and combined applications, along with quick turnaround, available capacity for high-volume automotive work, and on-site technical assistance.

Finishing Built Around Metal Stamping Programs

Stamped parts come in many shapes and sizes, from small brackets and clips to large panels and structural components. They may have sharp edges, tight bends, drawn features, holes, and nested geometry that can trap contaminants or create coating challenges. Racking, pretreatment, film thickness, and cure all affect the final result.

Consistent, repeatable coverage across high-volume runs
Coating on steel, aluminum, and other compatible metals
Corrosion protection for indoor, outdoor, and automotive environments
Coverage on edges, bends, holes, and formed features
Custom masking for critical surfaces where required
Color, gloss, and texture options for visible parts
Quality documentation and certified processes
Rapid turnaround when schedules are tight

Winona works with stampers to review material, part geometry, volume, corrosion requirements, appearance expectations, specification, and delivery schedule before production begins. Our goal is to make finishing one less thing to worry about.

Powder Coating for Stamped Parts

Our powder coating process is optimized to give stamped parts a tough, attractive finish that resists chipping, scratching, abrasion, moisture, UV, and chemicals. It also builds well on edges and corners, which are often vulnerable on stamped components.

A durable protective finish
Consistent appearance from run to run
Protection during shipping, assembly, and service
Specific colors, gloss levels, or textures
Efficient processing at volume
A low-VOC alternative to conventional liquid paint

Winona's powder coating lines are designed for high-quality, high-volume work, and we offer a wide range of colors and finish options. Powder coating is a strong fit for stamped parts that need:

Aluminum Stampings

Stamping aluminum? Winona operates a dedicated aluminum line in our Etna Green, Indiana plant, featuring a state-of-the-art pretreatment process optimized for aluminum composition.

Aluminum requires pretreatment designed for its specific surface characteristics. Proper preparation helps support adhesion, corrosion resistance, and long-term finish quality, particularly for parts used outdoors or in demanding environments.

E-Coat for Complete Corrosion Protection

E-coating deposits a uniform epoxy coating across conductive metal stamped parts. E-coat reaches recesses, tight corners, and complex formed features that can be difficult to cover with spray application, making it a good match for many stamped and welded assemblies.

Uniform coverage with controlled film thickness
Strong corrosion resistance
Efficient processing for high-volume programs
Coverage on complex or formed geometry
A standalone functional finish
A corrosion-resistant primer beneath powder coating

Winona's E-coat line includes a 13-stage pretreatment process with laser scale removal, zinc phosphate, and RO water. Automated indexing helps reduce air-pocket effects as parts enter the tank, supporting consistent coverage.

E-Coat Primer + Powder-Coated Topcoat

For stamped parts that face harsh environments, Winona can apply an E-coat primer with a powder-coated topcoat. The E-coat provides complete corrosion protection across the part, while the powder adds a durable exterior finish with color and abrasion resistance.

If the powder is chipped or scratched, the E-coat underneath continues to protect the metal from rust and chemical corrosion. This layered system is well suited to automotive, agricultural, construction, and outdoor applications.

An Experienced Coater for Stamped Metal Parts and Assemblies:

Winona finishes stamped components and assemblies for a wide range of industries and end product applications:

Brackets, clips, and mounting hardware
Automotive stampings and structural components
Seating and interior vehicle components
Panels, covers, and enclosures
Appliance and HVAC stamped components
Agricultural and construction equipment parts
Electrical and industrial equipment components
Progressive-die and deep-drawn parts
Stamped and welded assemblies
Aluminum stampings and formed components

The right process depends on the substrate, part geometry, corrosion exposure, appearance requirements, specification, and production volume.

The Winona Advantage, Working with U.S. Metal Stampers Since 1974:

Decades of Experience in Custom Coated Metal Stampings

Winona is the Midwest's high-volume, high-quality finisher with decades of experience finishing metal stampings.

Dedicated Aluminum Capability

Our Etna Green plant includes a dedicated line with pretreatment optimized for aluminum.

On-Site Technical Assistance

Winona can bring technical assistance to you, helping your team address finishing questions, part design concerns, or process challenges at your facility.

Capacity for High-Volume Automotive Work

We have available capacity for high-volume automotive programs, giving stampers room to grow.

Quality Certifications

Winona is a high-quality choice backed by documented quality certifications, including ISO 9001:2015.

Industry Recognition

Winona has been named a Products Finishing magazine Top Shop award winner four years running.

Quick Turnaround

We offer quick turnaround and work to keep your parts moving so you can meet your customers' schedules.

Custom Quote, Project Review, or Sample Run for Coated Stampings

If you are a metal stamping company looking for a reliable finishing partner, Winona is ready to help. We will review your part material, geometry, specifications, corrosion needs, color requirements, volume, and deadlines to recommend the right process.

Reach out to receive a custom quote for your project. Talk to Winona’s experts for a detailed project review. We can even provide free product samples or test runs to show you what Winona’s superior quality looks like.

Powder Coating and

E-Coating for Metal Stampings