Hi all, Im on my 6th smoke on my brand new 18.5 wsm and i noticed that my water pan isnt shiny anymore. I always smoke with my water pan with water in it- although during my last 14 hour some i did almost run out of water before i had to refill it. My water pan seems to have lost its "shine" on both sides and is no longer smooth. It also has a rust color in the inside (where the water goes). Is this the coating coming off? Thanks!