It is crystal clear.
Liquid Ice You can go as thick as you wish, build up thickness though, you might have to apply 5 or 6 layers, this thing gets hot while curing. It is sandable, you might order sanding agent and mix it with it for "easy" sanding. Allow time for each layer to cure - 24 hrs. you might find dust or dirt on the surface, it is ok, just sand the dirt off (400 grit) before pouring the next layer.