Thermoplastic Powder Coatings. Thermoplastic powder coatings were introduced in the 1950s, melting at spray temperatures and solidifying into a film upon cooling. Their processing and application methods are simple, requiring only heating to melt, leveling, cooling, or extracting to solidify into a film, without the need for complex curing equipment. Most of the raw materials used are common polymers available on the market, which can meet performance requirements under most conditions.