I find that getting the "Base" started is the most difficult part of building a rink and also requires the most patience.
Often times, Hollow spots happen when too much water is applied at one time. Almost like painting, Several thin coats make for a better end result than a few heavy ones.
Anyway, Just break all the hollow areas by simply walking on them and crushing the thin ice into chunks and then fill the voids with water, Initialy these "chunks" of ice (that will float to the surface) will make the rink look like a real mess, But since you are going to be applying several more coats, they will soon be incased in ice (probably) several inches below you skating surface.
Hope that Helped.
BTW: My rink is at about 2" thick now, nowhere near "level" yet though. I'm going to go out and flood a few times today even though it's almost too cold as the water flows like molasses in temps like we have today. -24.
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