Well.....DON'T!!!
I purchased the kit, with extra's as I heard one of each grit isn't enough and now what I have are scartches windows with sanding and frost marks on them!!!! The GD grits aren't enough to remove scratches, but are enough to mark the glass. The polishing compound on the other had is not good enough to polish out the frosting marks left by the sanding....
Now I'm just pissed.