How about that green slime that they put in tires to seal punctures? Just squirt it in, swish it around and PRESTO! no leaks!
Anybody ever tried microcrystaline wax? I used to use it to cast bronze sculpture. It's kind of hard and kind of sticky.You can buy it with different melting points too. Think that will be my next experiment. Oh, I'm in Washington state, USA. That might explain my sense of humor and my willingness to destroy something in the attempt at fixing it.