Powder coating is the process of applying a paint in the form of powder. Regular liquid type paints are pigments and binders suspended in solvents. Powder coating is solvent free so you are just using the dry pigments and binders. Once the powder is sprayed on your work piece, it must be baked from 350 to 400 degrees F for 10-20 minutes, with each powder having its own curing schedule. When the powder is heated, it melts into a liquid, connects together, cures, and once cooled, is dried to a hard, beautiful finish.
You can powder coat almost any object that can withstand the cure temperature of the powder. It is the most common to powder coat metal, however, you can also powder coat composites, MDF, glass, and other items that will not be damaged when subjected to powder coating temperatures.
Powder Coating metal serves a couple of purposes. The functional purpose is that it provides a barrier between the metal and the oxygen around it protecting it from corrosion. When it comes to iron or steel, this is very important to prevent rust. . However, if the powder coating is scratched, or chipped down to the bare metal underneath, rust can start in this spot. Media blasting a part before powder coating will provide a profile for the powder to adhere tightly to the part, this helps reduce the spread of rust underneath the powder coating after it is scratched and keeps it centralized to just the scratched area.