<P> Powder coating is a type of coating that is applied as a free - flowing, dry powder . The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form . The coating is typically applied electrostatically and is then cured under heat to allow it to flow and form a "skin". The powder may be a thermoplastic or a thermoset polymer . It is usually used to create a hard finish that is tougher than conventional paint . Powder coating is mainly used for coating of metals, such as household appliances, aluminum extrusions, drum hardware and automobile and bicycle parts . Newer technologies allow other materials, such as MDF (medium - density fibreboard), to be powder coated using different methods . The powder coating process was invented around 1945 by Daniel Gustin US Patent 2538562 . </P> <P> Because powder coating does not have a liquid carrier, it can produce thicker coatings than conventional liquid coatings without running or sagging, and powder coating produces minimal appearance differences between horizontally coated surfaces and vertically coated surfaces . Because no carrier fluid evaporates away, the coating process emits few volatile organic compounds (VOC). Finally, several powder colors can be applied before curing them all together, allowing color blending and bleed special effects in a single layer . </P>

When was powder coating invented and who invented it
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