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 melt - processed into the matrices of powder coatings . an article may be coated with a thermoset or thermoplastic powder which may be applied by electrostatic spray , by dipping it into a fluidized bed , or by thermal or flame spray .