# What Is Powder Coating? Viewrail's Process and Finish Options Explained
Powder coating is how Viewrail protects the metal in your railing system.
It's a finishing process in which dry powder is electrostatically applied to a metal surface, then baked on at high heat to create a hard, bonded shell. That shell keeps the underlying metal sealed against moisture, UV rays, and environmental contaminants.
Here's what you need to know about why it matters, how Viewrail does it, and which finish is right for your project.
### Why Aluminum Posts Need Powder Coating
Aluminum doesn't rust the way iron or steel does, it contains no iron, so the traditional rust process doesn't apply. What it does do is oxidize. When raw aluminum is exposed to moisture and air over time, a dull, chalky oxidation layer can begin to form on the surface. Left unsealed, this degrades both the appearance and the integrity of the metal.
Powder coating seals the surface entirely, cutting off that exposure before oxidation takes hold. It also adds color, gloss, and surface hardness that bare aluminum simply can't offer.
### How Viewrail Prepares and Coats Its Posts
Getting a powder coat to bond properly, and stay bonded for years, starts long before any powder is applied. Viewrail uses a tightly controlled, multi-step process on every post.
1. **Shot blasting** — Each post is blasted with fine media to strip surface contaminants and smooth out micro-inconsistencies in the metal.
2. **Chemical bath series** — Posts rotate through a series of chemical baths that clean and condition the surface at a molecular level, leaving it fully prepared to bond with the powder.
3. **Powder application** — Dry powder is applied electrostatically to ensure even, complete coverage across the entire surface.
4. **Computerized baking** — Posts go through a controlled baking process that superheats the powder and fuses it permanently to the metal.
The result is a consistent, durable finish that's built into the metal, not just sitting on top of it.
### Viewrail's Two Powder Coat Tiers
Viewrail offers two powder coat options, each rated to a different AAMA performance standard and suited to different environments.
#### High Performance Powder Coat (AAMA 2604)
Also referred to as Standard powder coat, this is Viewrail's baseline finish. It's formulated with super-durable polyester resins that resist chipping, scratching, and fading under normal outdoor conditions. AAMA 2604 coatings are tested against five years of real-world exposure in South Florida — heat, humidity, and UV included. It's a strong, reliable choice for most residential and light commercial exterior applications.
**Available colors:** Standard Black, Standard White, Standard Silver, Standard Bright Brass
#### Superior Performance Powder Coat (AAMA 2605)
Viewrail's top-tier finish. Superior Performance is a fluoropolymer-based coating that delivers the highest resistance to UV fading, color shift, and environmental degradation. It meets the AAMA 2605 specification and comes with a 5-year finish warranty. If your project is in a coastal region, a high-UV climate, or anywhere with elevated humidity or salt exposure, this is the finish to specify.
**Available colors:** Jet Black, Bright White, Burnished Bronze, Iron Oxide, Textured Black, Deep Pewter, Light Bronze, Warm Stone, Limestone Buff, Spruce Green, Desert Sand, Burnished Gold, Pistachio Green, Midnight Blue, Alabaster White, Textured Plaster, Gray Mist, Polished Silver, Graphite Gray
### Choosing the Right Finish for Your Project
| Environment | Recommended Finish |
| ---------------------------------- | -------------------------------- |
| Interior or sheltered outdoor | High Performance (AAMA 2604) |
| Standard exterior use | High Performance (AAMA 2604) |
| Coastal, high-UV, or harsh climate | Superior Performance (AAMA 2605) |
If you're working near saltwater or in an unusually harsh environment, it's worth talking to a Viewrail rep before you order. Some projects benefit from pairing Superior Performance powder coat with e-coat, an electrodeposition layer applied beneath the powder that reaches into seams and recesses where corrosion typically starts first.
If your project is exposed to salt air or heavy moisture, see [Why is Coastal Warranty Important](/guides/about-stairs-and-railing/railing-system-deep-dives/why-2205-stainless-steel-is-the-gold-standard-for-coastal-railing.md).
### Maintaining Your Powder Coated Railing
Powder coated posts are low maintenance by design. As long as the surface stays intact and sealed, it will keep protecting the metal underneath.
To keep things looking their best:
* **Clean regularly** with mild soap and water
* **Avoid harsh chemical cleaners** — they can degrade the finish over time
* **Inspect periodically** for chips or scratches, and address any exposed metal promptly to prevent oxidation from starting
Want to see the colors in person before you commit? You can order powder coat samples at [viewrail.com/samples](https://www.viewrail.com/samples/).
If you are planning a full railing system, see [How Do I Maintain Cable Railing?](/guides/maintenance/how-do-i-maintain-cable-railing.md) for broader upkeep guidance.
### Related topics
#### Compare materials and systems
* [Wood vs Metal Railing Posts: Which Is Better for Cable Railing?](/guides/planning/choose-the-right-railing-for-your-project/wood-vs-metal-railing-posts-which-is-better-for-cable-railing.md) — Compare durability, maintenance, and finish considerations.
* [What is Cable Railing?](/guides/about-stairs-and-railing/what-is-cable-railing.md) — See how powder-coated aluminum posts fit into a full cable railing system.
* [What is Glass Railing?](/guides/about-stairs-and-railing/what-is-glass-railing.md) — Compare post-supported glass systems and other modern railing options.
#### Choose for your environment
* [Why is Coastal Warranty Important](/guides/about-stairs-and-railing/railing-system-deep-dives/why-2205-stainless-steel-is-the-gold-standard-for-coastal-railing.md) — Learn when coastal exposure changes the right material and finish choice.
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