Custom Powder Coating Services for Sheet Metal Parts
SR MFG provides industrial-grade powder coating services for sheet metal parts, enclosures, panels, brackets, frames, and custom metal components. From sample approval to batch production, we control coating thickness, color consistency, masking, inspection records, and delivery planning to support stable OEM production.
Our powder coating process is suitable for carbon steel, stainless steel, galvanized steel, and aluminum parts. For projects requiring cosmetic consistency, corrosion resistance, assembly fit, or export documentation, we can help review your drawings, finish requirements, color standards, coating thickness, and inspection criteria before production.
Film Thickness Control
Typical 60 ±10 μm, with masking for critical areas.
Color Consistency
RAL / Pantone matching based on approved samples.
Corrosion Validation
Salt spray testing available per project requirements.
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Upload your drawings for engineering review.
Why Powder Coat Sheet Metal?
Powder coating is a practical finishing choice for sheet metal parts that need both surface protection and consistent appearance. It forms a durable coating layer on carbon steel, galvanized steel, stainless steel, and aluminum components, helping reduce rust, handling wear, chipping, and long-term appearance problems.
For OEM sheet metal products, powder coating is commonly used on electrical enclosures, outdoor equipment housings, industrial brackets, frames, panels, and structural components where durability, batch consistency, and clean appearance are important.
Corrosion Protection
Protects metal surfaces from rust and environmental attack.
Better Durability
Improves wear resistance and reduces chipping and paint peel.
Longer Service Life
Helps extend product life and reduce rework and warranty risk.
Ideal Applications
Suitable for outdoor equipment housings, electrical cabinets/enclosures, industrial brackets, and structural components.
What Is Powder Coating?
Powder coating is a dry finishing process used to create a durable protective layer on metal parts. Instead of liquid paint, it uses a fine powder made from resins, pigments, fillers, and curing agents.
Before coating, sheet metal parts are cleaned and pretreated to improve adhesion. The powder is then applied by electrostatic spray, where charged powder particles are attracted to the grounded metal surface.
After spraying, the parts are cured in an oven. During curing, the powder melts, flows, and crosslinks to form a continuous coating film on the metal surface.
Powder Coating Process Highlights
Pretreatment
Cleaning, degreasing, and surface preparation help improve coating adhesion and reduce surface defects.
Electrostatic Spraying
Charged powder particles are sprayed evenly onto the grounded metal part.
Oven Curing
The coated parts are heated so the powder melts, flows, and forms a continuous protective film.
Final Inspection
Appearance, coating thickness, adhesion, masking areas, and critical surfaces are checked according to project requirements.
Powder Coating Capability Snapshot
SR MFG supports powder coating for custom sheet metal parts, enclosures, panels, brackets, frames, and structural components. Our coating capability is reviewed based on part size, weight, surface area, coating thickness, color requirements, masking areas, and inspection standards.
For each project, we can evaluate your drawings and finish requirements to confirm the suitable powder type, target coating thickness, masking method, inspection plan, and batch production feasibility.
Max Part Size
Up to
L 6000 × H 2400 × W 700 mm
Max Part Weight
Up to
200 kg
per piece
Typical Thickness
50–100 μm Recommended target: 60–80 μm
MOQ Reference
Typical MOQ:
100 pcs / batch
Small runs reviewed case by case
Powder System Options
Epoxy
Best for indoor corrosion and chemical resistance.
Polyester
General-purpose outdoor weather resistance.
Epoxy /
Polyester Hybrid
Balanced appearance, value, and protection.
Super-Durable /
High-Performance
For stronger weathering resistance and longer service life.
Appearance Options
- Matte, gloss, sand texture, metallic, hammer tone
- RAL / Pantone matching available
- Approved sample control for consistent appearance
Masking & Protection
- Threaded holes: Kept clean and free of coating build-up.
- Grounding points: Protected to maintain electrical conductivity.
- Mating surfaces: Masked to ensure fit and function accuracy.
Quality & Validation
- Thickness control: Monitored to target range with records.
- Adhesion testing: Cross-cut and other methods as required.
- Corrosion resistance: Salt spray testing available when required.
Project Review Details for Powder Coating
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Project Review Details for Powder Coating
| Review Area | What We Check | Why It Matters |
|---|---|---|
| Part Size & Hanging Method | Part dimensions, hanging direction, hole position, and rack density. | Confirms whether the part can pass through the spray booth and curing oven efficiently. |
| Part Weight & Handling | Single-part weight, lifting method, fixture needs, and deformation risk. | Helps determine safe handling, hanging stability, and whether split coating is required. |
| Coating Thickness Target | Target thickness, tolerance range, coating build-up, and critical fit areas. | Prevents coating thickness from affecting assembly, threaded holes, grounding points, or mating surfaces. |
| Color & Appearance Approval | RAL / Pantone code, gloss level, texture, surface effect, and approved physical sample. | Keeps color, gloss, and texture consistent before batch production release. |
| Powder Type Selection | Indoor or outdoor use, UV exposure, chemical resistance, corrosion target, and service life requirement. | Helps select epoxy, polyester, hybrid, or high-performance powder based on real application conditions. |
| Masking Requirements | Threaded holes, grounding points, mating surfaces, contact areas, and no-coat zones. | Protects assembly function, electrical conductivity, and dimensional fit after coating. |
| Inspection Records | Coating thickness, adhesion, appearance, masking results, and final inspection records. | Supports customer receiving inspection, quality tracking, and project traceability. |
| Corrosion Validation | Salt spray requirement, test standard, exposure time, and acceptance criteria. | Confirms whether the coating system meets the intended service environment and performance target. |
How to Choose the Right Powder Coating System
Choosing the right powder coating system depends on where the part will be used, how long it needs to perform, and what appearance or corrosion resistance requirements must be met. SR MFG reviews the service environment, material, coating thickness, color requirements, masking areas, and validation standards before recommending a suitable powder coating solution.
Indoor Use
Epoxy or epoxy-polyester hybrid. Best for indoor cabinets, brackets, equipment frames, and structural parts with no long-term UV exposure.
General Outdoor Use
Polyester powder. Suitable for outdoor covers, brackets, fences, hardware, cabinet shells, and enclosure panels.
Coastal / Heavy Corrosion
Anti-corrosion primer + weatherable topcoat. Recommended for coastal cabinets, industrial frames, and parts exposed to salt spray or high humidity.
Architectural Exterior
Super-durable polyester. Used for façade components, exterior panels, and decorative parts requiring better weathering resistance.
Premium Exterior / Ultra-Long-Life
High-performance coating system. Suitable for demanding exterior applications with strict long-term appearance and weathering requirements.
Detailed Coating System Selection Guide
| Service Environment | Recommended Powder System | Recommended Build | Recommended DFT | Example Parts | Suggested Validation |
|---|---|---|---|---|---|
|
no UV exposure |
Epoxy or epoxy-polyester hybrid | Single coat | 60–80 μm (adjustable within 50–100 μm) |
Indoor cabinets, enclosures, brackets, equipment frames | DFT, adhesion, appearance; chemical or abrasion resistance if required |
|
UV exposure |
Polyester powder | Single coat; primer/base coat optional for higher corrosion target | 70–100 μm | Outdoor covers, fences, hardware, outdoor brackets | DFT, adhesion, salt spray or cyclic corrosion testing if required |
|
heavy corrosion |
Polyester or super-durable polyester topcoat with anti-corrosion primer | Two-coat system preferred | Total 120–200 μm | Coastal cabinets, industrial frames, parts exposed to salt spray or high humidity | Cyclic corrosion testing recommended; define acceptance criteria |
|
exterior |
Super-durable polyester aligned with AAMA 2604 when specified | Per specification, often single coat | Typically ≥30 μm depending on system | Façade accessories, decorative panels | Test to AAMA 2604 when required |
|
ultra-long-life exterior |
High-performance system aligned with AAMA 2605 when specified | Per specification, may be multi-coat | Per specification | Landmark projects and demanding exterior parts | Test to AAMA 2605 when required |
Your Content Goes Here
Powder coating quality is not determined only by the coating process. Part geometry, edge condition, drainage, masking areas, material porosity, and heat sensitivity can all affect coating coverage, adhesion, corrosion resistance, and final appearance.
Deep Recesses & Inside Corners
Risk: Faraday effect can leave inner corners with light coverage or bare spots.
Design Recommendation: Add inside radii, avoid narrow deep channels, and allow spray access.
Sharp Edges & Burrs
Risk: Sharp edges often receive thinner film build and become corrosion weak points.
Design Recommendation: Deburr, break corners, and add small radii where possible.
Enclosed Cavities & Tubes
Risk: Trapped pretreatment liquid or moisture can cause blistering, corrosion, or drying defects.
Design Recommendation: Add drain and vent holes, especially near the lowest point or closed end.
Outgassing & Pinholes
Risk: Castings, galvanized parts, or weld porosity may release gas during curing and create pinholes.
Design Recommendation: Use pre-bake / outgas bake; add primer or sealer when needed.
Large or Thin Panels
Risk: Heat and hanging conditions can increase warping, oil-canning, or uneven film build.
Design Recommendation: Review hanging direction, support points, stiffness, and visible surfaces.
Critical Functional Surfaces
Risk: Coating build-up can affect threads, grounding points, mating surfaces, and fit.
Design Recommendation: Clearly define no-coat, masking, and thickness-limited areas on the drawing.
Are you ready to get started on your metal fabrication project?
Not sure which material is ideal for your project? Feel free to contact us.Our engineering team will recommend suitable material grades and sheet thicknesses based on strength, weight, corrosion resistance and overall cost.
Industries & Powder Coating Applications
SR MFG provides professional powder coating services for OEM metal parts used in industrial equipment, cabinets, brackets, frames, enclosures, and structural assemblies. From single prototypes to high-volume production runs, we deliver durable, uniform finishes with consistent color and texture across every order.
Data Centers & IT Equipment
Powder coated components for data centers, network infrastructure, and IT hardware, delivering corrosion-resistant, professional-grade finishes that withstand continuous indoor operation.
- Server rack frames & rails
- Cable management trays
- Cabinet panels & doors
- Mounting brackets & plates
Consumer Electronics
Powder coating for consumer electronics housings, internal brackets, display structures, and precision metal parts, offering smooth, consistent color with excellent scratch and fingerprint resistance.
- Device housings & covers
- Internal support brackets
- Display mounting structures
- Speaker & audio metal parts
- Small precision formed parts
Electrical Equipment
Powder coated components for electrical enclosures, control cabinets, power distribution units, and industrial electrical systems, providing electrically insulating finishes with strong corrosion and chemical resistance.
- Electrical cabinet enclosures
- Control box panels
- Terminal mounting plates
- DIN rail brackets
- Ventilation and access panels
Industrial Equipment
Durable powder coated finishes for machinery, automation systems, production equipment, and structural machine assemblies, built to resist chipping, abrasion, and shop-floor wear.
- Machine covers & guards
- Equipment frames
- Conveyor brackets
- Sensor mounting plates
- Protective panels & shields
New Energy Systems
Powder coating solutions for EV charging equipment, battery systems, energy storage cabinets, and power conversion units, delivering long-lasting UV-stable finishes rated for demanding indoor and outdoor environments.
- Battery enclosure parts
- Charging station cabinets
- Energy storage cabinet panels
- Busbar support brackets
- Power module housings
Outdoor Equipment
Weather-resistant powder coated finishes for outdoor enclosures, equipment covers, BBQ grills, lighting systems, and structural fixtures, engineered for UV stability, moisture protection, and years of fade-resistant color retention.
- Outdoor equipment housings
- BBQ grill sheet metal bodies
- Protective covers & panels
- Mounting brackets
- Weather-resistant structural parts
Built for Your Application
Whether you need a single sample or full production volumes, SR MFG ensures consistent coating thickness, uniform color matching, and reliable delivery for every powder coating project. We offer a wide selection of RAL colors, gloss levels, and texture finishes to match your specifications.
SR MFG Powder Coating Product Showcase
Sheet Metal Powder Coating FAQs
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Typical DFT range: 50–100 μm
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Typical build: 60 ± 10 μm
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Recommended target: 60–80 μm (balanced corrosion protection and cost)
If a critical mating/locating surface needs thickness control or must be left uncoated, we typically use a combination of:
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Masking for thickness control: High-temperature masking film/tape creates a controlled “window” to prevent build-up that could affect fit.
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Built-in process allowance: Add a small masking step/ledge in the design so the masking edge doesn’t land on a Class A surface.
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Closed-loop verification: DFT can be measured per ASTM D7091 (calibration/verification/adjustment + compliant measurements) with records retained to ensure reliable production readings.
We support RAL / Pantone matching, and production is controlled to the approved sample. During production we compare under standardized lighting, and the ΔE target can be defined per project (down to ≤ 1.0 when required).
The main limitation with metallics and pearlescents is visual physics: flake orientation can create angle-dependent color shift, sparkle differences, and higher sensitivity to batch and application parameters. To manage this, we typically:
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Use the same powder lot for the same assembly or cosmetic surface whenever possible.
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Define a clearer acceptance method for effect colors (specified light source, viewing angle, allowable color/appearance tolerances).
We can arrange testing per ASTM B117 or ISO 9227 (NSS/AASS/CASS), as required.
Key notes:
-
ASTM B117 defines the test environment, but does not specify test duration or pass/fail criteria. Duration and acceptance criteria must come from your spec or a mutually signed inspection standard.
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ISO 9227 defines frameworks for NSS (neutral salt spray), AASS (acetic acid salt spray), and CASS (copper-accelerated acetic acid salt spray), including method and condition requirements.
A typical salt spray report can include (formatted to your template if needed): sample and lot information, pretreatment/coating system and DFT, test method and parameters, duration, inspection frequency, photos, and your specified acceptance items (e.g., blister rating, rust area, scribe creep/undercut, etc.).
In deep recesses and inside corners, electric field lines favor the shortest path to ground. Powder builds on outer edges while recesses become hard to coat—this is the classic Faraday cage effect.
Our typical combined approach:
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Lower kV and limit µA (many practical setups reduce recess spraying to roughly 40–60 kV, then fine-tune).
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Reduce powder output and airflow, and adjust gun distance/angle to “feed” a softer cloud into corners.
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If needed, use strategies better suited for complex geometry (pulse control, different nozzles/patterns, or evaluating tribo application where appropriate and validated).
Pinholes/blisters are most often caused by outgassing: gas or moisture trapped in the substrate/surface layer (porosity, zinc layer, oxides, residual water/contamination) is released during curing and breaks through the molten film.
When we strongly recommend (or require) a pre-bake / outgas bake:
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Galvanized parts: the zinc layer and surface oxides can trap moisture/air that releases during heating.
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Castings/die cast/porous substrates and welded structures: porosity can release gas rapidly during cure—pre-bake is recommended, and outgas-forgiving powder (OGF) may be evaluated.
We also emphasize curing to verified PMT (Part Metal Temperature) and recording the cure curve—avoiding situations where air temperature reaches target but the part does not.
We first assess defect type and scope:
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Minor scuffs/small defects: may be repairable with a matching touch-up system (liquid touch-up is common for field repair).
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Class A cosmetic surfaces or corrosion-critical defects: typically recommend stripping, re-pretreating, and re-coating, then repeating key inspections (DFT/adhesion/appearance).
For color consistency: solid colors are generally easier to match. Metallics/pearls are more sensitive because flake orientation and gloss/texture affect appearance—repairs are more visible. We usually define the rework strategy and acceptance method during sample approval.
Wear resistance doesn’t mean a coating is immune to rub marks. Our common approach:
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Pack only after parts cool to room temperature to avoid tape/film imprints and condensation issues.
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Isolate Class A surfaces: non-woven sleeves/bags, foam separators, layered pads—no face-to-face stacking.
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Transit protection: edge guards and custom dunnage to reduce vibration-driven abrasion.
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MOQ: 100 pcs per batch (small runs negotiable; custom colors may be limited by powder supplier MOQ).
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Changeover time: standard colors ≤ 30 minutes; metallic/special-effect colors ≤ 60 minutes (depends on scheduling).
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Standard lead time: typically 3–7 days, depending on quantity, geometry, masking tooling, and validation requirements.
If salt spray/weathering validation is required, please specify method + duration + acceptance criteria in the PO/inspection standard—lead time will be adjusted accordingly.
Yes—on a project basis. We first confirm:
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AAMA 2604/2605 are common benchmarks for performance and test methods for factory-applied organic coatings used in architectural exterior applications (typically aluminum extrusions and panels).
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Whether you need 2604 vs. 2605 depends on service-life targets, color/gloss requirements, and exposure environment.
We select an appropriate powder system (e.g., super-durable polyester or higher-performance systems), define the validation plan (DFT, adhesion, corrosion resistance, weathering/color & gloss retention, etc.) in the inspection standard, and can support third-party lab reports when required.
Powder Coating Technical Resources
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