improved powder coatings exhibit enhanced resistance to bacterial and fungal attack , while possessing excellent toughness , appearance , corrosion resistance , durability , processability , and ease of application . the coating is comprised of anti - microbial agents that are homogeneously dispersed within the powder or impact fused to powder particles or both . an article may be coated with a thermoset thermoplastic , or radiation curable powder , which may be applied by electrostatic spray or fluidized bed or by thermal or flame spray .