Instruct: Classify Amazon reviews into positive or negative sentiment
Query: lavapad

I bought 2! both don't work... after you use it once you can only use it again if you re-heat in boiling water. The lava pad gets hard as a rock after you put it in boiling water and let it cools down... You can't re-pop it.... !!! 10 thumbs DOWN... can the web site [...] doesn't exist.!!!!