It's some form of blue plastic glue.

Took a bit too much effort to get it out of the packaging, used it, didn't do anything. Put it back in the spiffy box it came in.

Decided to try it again the next day, couldn't remove it from the box, literally could not separate it from the plastic box at all.

Sent it back to Amazon, ordered some Adams instead.

Amazon gave me *store credit* instead of refunding my CC (after I'd paid for the Adams stuff).