Guess what I found out...
I was looking up information on Alex O'Loughlin (Will) and i found out that he is heavily tatooed on his torso and arms. When he was topless in a few of the scenes in the movie, they had to stack on the make-up to cover them up. He always wore long sleeved clothing too. They did a good job of covering them up!
I'm Blonde...what's your excuse???