Guys, I have a late 2008 unibody Macbook Pro. I bought and "installed" the invisible shield on the same day as I received my new Macbook. But I noticed a little yellow coloration on the palm rest protection. Should I peel off? I mean, has anyone noticed any yellow coloration on the palm rest of your macbook pro WITHOUT using a protection? The "natural aluminum" only? i am afraid of peeling the invisible shield off of the palm rest area and after it gets yellow Thanks!