Powder coating is the process of coating metal with a plastic finish applied in powder form, and then baked to a fluid state, to bond it to the metal surface. Powder coating has many advantages over traditional liquid coating: It applies thicker without running, it’s better for the environment, and is easy to style with.
The powder coating process is very similar to a regular painting process except that the “paint” is a dry powder instead of a liquid. The powder sticks to the parts due to the grounding of the parts and electrostatic charging of the powder. Any substrate that can tolerate the heat of curing the powder and that can be electrically grounded to enhance charged particle attachment can be used. The powder flows and cures during the heating process.
Sandblasting is the best way for a part to be prepared for powder coating by powering away rust, dirt, old paint, grease, or any other element that may contaminate the part being coated. Sandblasting blasts away any contaminants that could affect the powder coating process using air pressure and millions of tiny particles.