To achieve good adhesion and corrosion resistance, primer is applied to the powder coating. The selection of primer before powder coating application depends entirely on the substrate (metal, plastic, wood, etc.) and the surrounding environment on which the primer is applied. Usually, five types of primers can be used before powder coating — etch primer, zinc-rich primer, and polyester primer are suitable for metal substrates, while epoxy primer and acrylic primers are ideal for metal, wood, and plastic substrates.

If not correctly prepared, powder coating raw steel with clear powder may lead to rust or corrosion. To avoid this, ensure the steel is clean and free from rust or oil before applying the clear powder. Typically, epoxy powder coating offers both corrosion and chemical resistance. Additionally, it's a cost-effective option.

Yes, polished/machined aluminum can be effectively protected by powder coating. Especially with a prismatic clear vision, it might look strange or eventually turn yellow. It's better to test a small area first to assess its appearance and durability before applying it to the entire surface.

To make your surface smooth and flat, start by cleaning it properly. Use high-quality materials and proper application techniques, such as spraying evenly and consistently. Sanding between coats can also help achieve a smoother finish.

When deciding between epoxy primer and spot aluminum welding, consider how serious the damage is, along with the cost and time. Epoxy primer works well for minor issues like tiny scratches or small holes. But if you've got major problems or structural issues, spot aluminum welding is a better choice because it's stronger. Using an epoxy primer is cheaper for fixing wheels, but if you go for aluminum spot welding, it costs more because it needs special tools and skills.

Storing powder-coated items in the oven overnight before curing them the next day can cause problems. If the oven isn't clean, dirt could stick to the coating and mess it up. Moisture in the oven might get into the coating and cause bubbles or blisters when cured. If you turn on the oven too quickly without giving the items time to warm up first, the sudden change in temperature could make the coating crack or peel off.

Yes, powder coating in your auto shop could be harmed if exposed to oil changes or brake cleaning activities near the coating. Oil changing and brake cleaning involve various chemicals that may react with powder coating, leading to adhesion issues and decreased durability and color quality.

Take the following steps to stop the orange peel on your rims during the powder coating application.

1. The rim surface should be clean – free from dirt and oil.
2. Apply the powder coating in multiple thin layers.
3. Avoid applying too much coating at one time and in the same place.
4. Keep the spraying speed constant, with the same rate of flow throughout the application.
5. Follow the instructions regarding the curing time  for the particular powder coating you are applying.
6. Observe any required flash-off period before putting the item in the oven.