If you’re wondering, “Is powder coating rustproof?” the answer is no, not completely. But when it’s prepped and applied properly, powder coating provides incredible, durable protection that is usually superior to paint. You end up with a strong barrier between bare metal and moisture, oxygen, chemicals, and other elements that contribute to corrosion.
The powder coating itself is just part of the equation. You also need thorough surface preparation and the right equipment to create a coating that bonds properly and holds up over time. Here’s what to know about rust prevention and how our process at Powder Craft helps protect your metal.
How Does Powder Coating Help Prevent Rust?
When you work with Powder Craft, we electrostatically apply the powder so it clings evenly to your metal object. The controlled heat allows the powder to melt, flow together, and form a hard, bonded finish over the surface that helps protect against:
- Moisture
- Weather exposure
- Chemicals
- Scratches and abrasion
- Corrosion
As the only shop in Northern California with a pyrolytic cleaning oven, also called a burn-off oven, our team at Powder Craft can also strip away old coatings and contaminants to expose a clean metal surface before coating.
Where Does Rust Usually Start on Powder-Coated Metal?
Rust doesn’t usually appear at random in the middle of a quality, intact coating. Instead, you’ll first notice it on vulnerable areas including sharp edges, welds, seams, joints, and areas where existing rust wasn’t fully removed before coating. Once moisture reaches exposed steel, corrosion can begin underneath or around the damaged coating. It’s better to address and repair any small chips before the rust has time to spread.
Can Powder-Coated Metal Still Rust Outdoors?
Yes, powder-coated items can still rust outdoors, but the exposure to the elements isn’t the only issue. It depends on how the metal was prepared and coated, along with the conditions the item is exposed to:
- Covered patio furniture faces much less exposure than equipment that sits in the rain year-round
- Coastal and salty environments are harsher than dry inland conditions
- Metal that gets scratched or bumped frequently has a greater risk of exposing the bare metal underneath
Let us know how you plan to use the item and your goals. We can fully prepare and coat the item for its intended use and explain how to care for the finish once it leaves our shop.
Powder Coating Rust FAQs
Is powder coating completely rustproof?
No, powder coating isn’t completely rustproof, but can provide durable corrosion resistance that lasts for years. If the coating is damaged and bare steel is exposed to moisture and oxygen, rust can eventually develop.
How long does powder coating protect metal from rust?
Powder-coated parts all have different lifespans because the condition of the metal, surface preparation, weather exposure, and wear and tear all impact the finish. A patio chair under cover and a steel part exposed to constant weather are dealing with very different conditions. As a general rule, a quality powder coating that’s been professionally applied can last for years.
Can you powder coat over existing rust?
Any existing rust needs to be addressed before powder coating. Simply coating over corrosion can leave a weak surface underneath the new finish and interfere with adhesion. Proper cleaning and pretreatment are also important parts of good corrosion resistance.
Why is my powder-coated metal starting to rust?
Look for chips, scratches, seams, edges, welds, or other places where bare metal may be exposed. Rust can also point to poor surface preparation or a coating system that wasn’t suited to the conditions the item is exposed to. Finding where the corrosion started can help determine whether you’re dealing with one damaged spot or a larger coating failure.
Can rusty metal be stripped and powder coated again?
Yes, rusty metal can usually be stripped and powder coated again, but it depends on the condition of the item. Our team at Powder Craft removes the existing coating and corrosion, prepare the metal, and make sure the surface is ready for a new coating. If the rust has caused significant pitting or structural damage, we can take a look at the condition of the metal and let you know if it’s a good candidate for coating.
Ready to Powder Coat Your Metal?
If you’re seeing rust, bubbling, chips, or areas where bare metal is exposed, don’t wait for the damage to spread. Powder Craft can inspect the part, look at the condition of the existing coating, and determine whether stripping and recoating makes sense. Catching corrosion as early as possible can give you more options while helping protect the metal underneath.
Get in touch with us at Powder Craft and we’ll to talk through the best option for your item.
