I am going to be giving my fury a hot water bath in the near future, and i just had a couple of questions about it. Someone told me that there would be no need to cover weight hole and the thumb hole since it does not have the rubber grips in them. I do have a slug in the thumb though. wouldnt the water just soak right into the ball if i dont cover up those holes? i would imagine that i would not want that to happen. secondly, how long do you let the ball soak roughly before removing it and changing the water?