As I recall, I have never wetsanded anything before. That being said, I'm a bit weary of wetsanding the headlamp on my Miata. It's a little yellowed and has some UV cracking. Not terribly, but the other headlamp looks pristine and I want them to match as closely as possible. I was planning to start with a 600 grit, then move progressively to a 3000 grit before moving to a rubbing compound, then ScratchX, then finishing with some Ultimate polish and headlight UV protectant. That all seems fine, but I have some questions. 1) How long do I spend on each grit level, and 2) do I use soapy water or plain water? Just wanting to make sure I do it right the first time and not have to worry again.