Are you sure you're bleeding it right? You need to have the bleeder in the closed position, push down the pedal and hold. Then open the bleeder for a second (keep foot pressure), close the bleeder, and then pull up the clutch lever. REPEAT.
There should not be any sealant on the clutch line threads that go into the slave cylinder. If you're concerned about a leak spray the slave cylinder down with break parts cleaner and allow it to dry,then pump the pedal for a minute or so. If there's a leak you'll see that area wet with fluid.
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