We don't accept any racist/porn(that shows genitalia)/violent/disgusting sprays, we have young players on our servers, we don't want them to see such things.
However as this is your first sprayban and unban request you can ask an admin ingame to unban it by asking them to check the forums for your unban request to verify that it's your first time receiving a sprayban as you would most likely not get an unban if it were to be your second time. I suggest you keep that in mind if you were to switch it back to something that we do not tolerate on our gameservers.