Definition - What does Bittiness mean?
Bittiness refers to a coating defect on a substrate surface that is characterized by material contamination of the applied paint. This contamination is often a solid substance that is visibly protruded from the metal's surface.
Corrosionpedia explains Bittiness
Bittiness gives an otherwise smooth metal surface a rough and uneven appearance. It is also known as peppery when the trapped solid particulates under the coating are small, seed-like and widely dispersed.
Bittiness is often caused by improper cleaning of the metal substrate surface prior to coating application. It may also be a primary cause of crevice corrosion due to moisture confinement. Proper surface cleaning is an ideal preventative measure.