I just finished polishing my swingarm and 400grit is way to harsh if you want to get a shine out of it. I used 600, then 800, then 1000, then 1500, then finally finished with 2000 grit. It looks like a mirror. I guess it all depends on what you want it to look like when its finished. Wet sanding is just using the sand paper when its wet, nothing to it. Plus when your using the high grits, the water helps get rid of the removed aluminum, so your not gouging the smooth surface with the tiny little aluminum particles. I'd then apply some clear coat so your finish isn't all ruined the first day you go out :) Good luck.