Wheels are one of the best candidates for powder coating. They're made of aluminium or steel, they tolerate the cure temperature, and they take hard use. A proper powder coat lasts 10–15 years with basic maintenance. A poor one starts chipping in 18 months.
Here's what separates one from the other.
Step 1: What comes off the wheel
Before powder goes on, everything else comes off. On bare-metal new wheels this is straightforward. On a previously coated wheel, we media blast to bare metal — no exceptions. Powder over existing powder produces a finish that looks fine until the first stone chip, at which point the layer stack delaminates and you're looking at a circular failure around every impact point.
Step 2: Sandblast, not grind
The profile after blasting matters. Grinding leaves a smooth, directional surface that powder has less to bond to. Blasting creates a uniform angular profile at the microscopic level — a dramatically better mechanical key. We use aluminium oxide media for alloys, steel shot for steel wheels.
Step 3: Chemical clean and phosphate
After blasting, the wheel gets a solvent wipe, then an iron phosphate wash. Phosphating converts the surface oxidation layer into a stable compound that actually improves adhesion and slows corrosion under the film. Most shops skip this step. It's one reason wheels fail.
Step 4: Choosing your finish
Through Prismatic Powders USA, we have access to over 6,500 formulations. The main categories:
- 01Solid gloss/satin/matte: The most durable. Gloss lasts longest; matte scuffs more visibly but polishes out.
- 02Metallic: Contains aluminium flake for depth. Looks closer to factory than solid at a distance.
- 03Colour-shift: Changes hue with viewing angle. Dramatic, harder to touch up.
- 04Chrome effect: Not chrome — but a very close visual match at a fraction of the cost and weight.
- 05Candy: A translucent coat over a metallic base for deep, jewelled colour. Requires two-stage process.
What to ask any shop
1. Do they blast to bare metal or sand over existing coating? 2. Do they phosphate before powder? 3. What oven temperature and dwell time do they use? 4. Can they show you a film thickness gauge reading?
If they can't answer all four, that's your answer.