Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Use only as a backup

I was wet, cold, and very tired that night I spent on the mountain. I shaved off a pile of this to start my fire. It goes "poof" when the spark hits it. I never got a fire started, all the wood around was wet. What I have used with 100% success is Fire Ribbon. It is in a tube like toothpaste . It will burn while floating in water. It also burns along time. I now carry a half used tube (smaller that way) in my kit. It always, alway lights.... Is about $3.00 at REI. Happy trails...