Step 4Smooth out the Edges
You may wish to wear gloves for this as well.
Scrape the edge of your bottleneck on some smooth pavement. It will help it it's wet. Grind it at different angles to round out the broken edge until you can see that it is no longer sharp. If you wish to get a smoother edge, proceed to sandpaper and smooth as much as you like.
If you don't have access to some smooth pavement use sandpaper, since it works just as well, but not as quickly. Sand inside and out, leave no sharp cutting edges.
I prefer the rougher look and I only use sandpaper on the inside of the edge. I'm sure if you worked your way to finer sandpaper and polished, perhaps with a Dremel tool, you could get a nice, factory-looking edge on it. Since this is homemade, I'm fine with the homemade look.
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