Powder coating is the most durable finish you can put on an alloy wheel. Done properly, it outperforms paint in every relevant metric — chip resistance, hardness, chemical resistance, and longevity. But done poorly, it fails faster than a cheap rattle can. The difference is almost always in the preparation.

This guide covers the full process from start to finish: stripping, outgassing, cleaning, masking, application, cure, and clear coat. It applies to any powder coat formulation, and there's some great options to chose from - more on that below.

Why Powder Coat Your Wheels?

The mechanical properties of a properly cured powder coat are genuinely impressive. It's applied as a dry electrostatic spray, then melted and chemically cross-linked in a curing oven, forming a continuous, seamless film. There are no solvents, (care about sustainability? Check. Don't want your workers breathing in solvents - not to mention the smell? Check.) The cured film is tough, durable and when done right, looks phenomenal.

For wheels specifically, the relevant advantages are: resistance to brake dust (which is corrosive), resistance to stone chips from road debris, tolerance of the heat cycles that come from repeated braking, and the ability to withstand wheel cleaning chemicals that would strip most paint finishes over time.

Stripping the Old Coating

You cannot powder coat over an existing coating — the old finish must come off entirely. Two main options:

Chemical Stripping

Aircraft-grade paint stripper or specialist powder coat remover dissolves the existing film. Effective on most finishes, though it can take multiple applications on older or thicker coatings. Advantages: no risk of mechanical damage to the wheel surface, relatively inexpensive. Disadvantages: chemical handling hazards, slow, and you need to neutralize and clean thoroughly afterwards before any powder is applied.

Cleaning and Degreasing

After prepping the part, the wheel must be completely free of oils, grease, and contamination. Any residue under the powder will cause adhesion failure — you'll see blistering or peeling shortly after the job leaves the oven.

Use a dedicated metal degreaser or acetone on a clean lint-free cloth. Work methodically across the entire surface. Do not use petroleum-based solvents, which can leave a residue. Once degreased, handle the wheel only in clean nitrile gloves. The oils from skin are enough to ruin adhesion.

Masking

Masking tip: Three areas on every wheel must be masked without exception: valve stem holes, lug nut seat tapers, and bead seats (the machined shelf where the tire seals). Powder coat inside the bead seat will prevent the tire from seating correctly, causing air leaks. High-temperature masking plugs are available in standard sizes — use them. For bead seats, self-adhesive high-temp tape applied with care is the standard approach.

Mask the center bore if it's a precision fit to your hub — powder adds approximately 50–80 microns of thickness, which can cause fitment issues on close-tolerance hubs. If in doubt, mask it and clean up the bore after cure with a small amount of fine wet-and-dry.

Sandblasting

Fast, thorough, and leaves the surface with a profile that aids powder adhesion. The go-to method for professional shops. The risk is using too aggressive a media or too high a pressure on cast alloy wheels — particularly softer alloys — which can warp or thin the metal. Use a fine media (80–120 grit aluminum oxide or glass bead) and keep the pressure controlled. After blasting, the wheel must be handled in clean gloves immediately — fingerprints are enough to contaminate a freshly blasted surface.

Blow off

Blow off the substrate with a high -pressure air nozzle to remove any sandblasting media/dust left on the surface.

Outgassing: The Step Most People Skip

Critical step for cast alloy wheels: Before applying any powder, pre-heat the bare wheel at full cure temperature — typically 450°F — for 20–30  minutes. Cast alloys contain trapped gases and moisture in the metal structure. Without pre-heating, these gases expand during the cure cycle and push up through the newly melted powder film, causing pinholes. Once you see pinholes in a cured coat, you're stripping and starting again.

This step is non-negotiable for cast wheels. Forged wheels are less prone to it, but pre-heating costs nothing and guarantees a clean surface — so worth doing regardless. Allow the wheel to cool completely before applying powder.

Application

  • Ensure a good ground earthern ground is established before application
  • Ensure the powder cloud is not too heavy or too low, adjust accordingly
  • Verify the powder flow is consistent and uniform and not surging while pulling the trigger before starting to apply powder.
  • Check the powder gun manufacturer's recommended voltage - typically 60–80kV for most polyester powders. Maintain a consistent distance from the surface (150–200mm) and use smooth, even passes. Do not pile on a thick coat trying to achieve coverage in one hit. A single even layer is the target. Thick application leads to orange peel, runs once the powder flows in the oven, and can trap air.
  • Powder naturally pulls to edges and sharp features - these areas attract more charge and will build thickness faster. Be conscious of this on spoke edges and machined details.

Inspection

  • Use a light source to check coated part.
  • Typically, you want to illuminate the all the areas of the wheel  (specially the recessed areas) directly on 90 degrees to the surface to see any light areas.
  • Add any additional coating if needed.
  • Lastly Illuminate the area at 10 degree of the surface around the work piece we are looking for uniformity ( if there is not surface uniformity  it won’t be uniform appearance after cure).

Cure

If additional layers of powder are expected to be applied, partially cure the first layers/base coats.

Follow the data sheet for the specific product you're using. Most standard and super durable polyesters cure at 360–400°F for 10 - 20 minutes at metal temperature — not oven air temperature. A large wheel rim takes time to come up to temperature from cold. If you cure by time alone and the metal hasn't reached cure temperature, you'll get an under-cured coat that scratches easily and has poor adhesion.

Allow full cooling before handling. The coat is hard but still warm — any contact while warm risks marring the surface.

Clear Coat

For solid colors on wheels, a clear coat is optional but adds gloss depth and an additional layer of protection. For metallics and candy coats, a clear coat is essential — metallic flakes near the surface are vulnerable to oxidation without it, and candy layers need sealing to maintain their translucency and depth. Apply the clear as a separate coat after the base is fully cured, then cure again per the clear coat data sheet.

Common Mistakes

  • Skipping the outgas step — the single most common cause of pinholes in wheel coatings
  • Contamination — handling bare metal without gloves, or insufficient degreasing after stripping
  • Over-application — heavy powder coats sag and orange-peel. One even coat is correct
  • Under-cure — not accounting for the time the metal takes to reach temperature, resulting in a soft finish
  • Poor masking — powder in the bead seats is a painful problem to fix once the tire is fitted
  • Rushing the cool-down — forced cooling or handling while warm damages the surface

Incredible Powder Coating Colors

As well as great technical advice, the OpenThrottle powder collection offers a wide range of gorgeous colors and effects, from candies, brights and neons, to sultry darks, amazing metallics and primer and clear coat options. Can't find what you need? Check out the rest of our Polychem colors, or ask about a custom color match - custom colors are available in 5lb minimums!