I've only been brewing kombucha for about six weeks now. My first mother is still rather thin, but produces lovely tea, so I just let her be. My second mother (actually a daughter of the first) is on her maiden brew now. The ferment below her tastes pretty good, just needs a few more days, but rather than being rubbery/Grey/blobby it's an almost uniform, waxy white layer.
Has anyone experienced this?