What do you need to wet sand? If it's minor scratches or swirl marks, try a cutting compound. When I had my Mitsu Lancer I took off the LANCER letters off the back and scuffed the clear coat pretty bad (you could see scuffs outlining LANCER). So a paint shop sold me a buffer and some cutting compound. I don't remember exactly how it works, but when I was done with the compound I waxed the car and the scuffs were completely gone.
FYI the second step of Mcguire's three step is a very light cutting compound. The compound I used was medium.