coated / coded [ˈko:dəd]
coated – past tense & part. of coat v. tr. – 1. apply a layer of paint, etc., to provide a protective covering; 2. form a covering over
coded – past tense & part. of code – 1. put a message into a program or specific form; 2. had a particular sequence; 3. to translate or arrange into a code, as in a secret message requiring a key to decipher