Type of wok and how to go about seasoning it
I had a very similar coating on the wok I bought recently.  The person I bought it from explained that the coating had to be burnt off, and not scrubbed off.  I put the wok on a high flame and made sure to flame the entire surface of the wok, including the sides.
The coating smokes and burns, but once it is off you will find yourself with a good carbon steel wok. it does take some time and great heat to burn it off so persevere.