Gley pond sealing and.... methane digesters?

So.... I was thinking, methane digesters for biofuel is anaerobic digestion. Gley is anaerobically digested. Gley is used to seal ponds. Does anyone know if this would work? Using spent slush from methane digesters to seal ponds?

the only trouble is that spent slush is also known as good compost. Gley is anaerobic yes but the goal is a biological gel not just any anaerobic breakdown will work for gley. Think 8 inches of banana leaf covered in carboard and soil, the methane digester wont be outputting enough for any pond building session in 1 go. The breakdown needs to happen in place so it bonds with the earth, even the sluggy juice can't be layed thick enough before it would slide and pool.
Sorry to put a downer on a great concept, if you really want to apply gley as more of a paste then fresh albumen full cow manure is your friend.