WR is Performance White tri coat. Opal is a different color, as is the other tri coat, Vibrant White? (I can't remember what it is called, it is very white, not like Performance White or Opal).
I would guess it would have to be 2 or 3 stages, there was a chip repair on my car when I bought it, and it looks horrible.
97 Mark VIII LSC/Silver/Gray leather
97 Cougar 4.6 Sport/White Opalescent Tricoat Metallic /Gray leather down but not out?
89 Cougar LS 3.8/Oxford White/Gray velour/HG need replaced AGAIN
00 Grand Marquis LS/Vibrant White/Gray velour
63 Falcon 302/black and rust/shed isn't moving
82 F-150/Oxford White/dumb VV carb doesn't pass emissions