Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This stuff is the stuff!

I'm somewhat new to caulking but needed to weather-proof a 100 year old craftsman after our first winter in it proved a little on the chilly side. I got the hang of it after about 1 tube of this stuff and was doing straight, neat lines on the outside frames of our basement windows.We'll see how it stands up. I figure if it saves us even 5% on the utility bills we saw last year it will be well worth it.