In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.
Q: I've been using this stuff for over 20 years. A single can lasts a very long time. For expensive varnishes and oil paints that you wont use for years, this will save you money and time by keeping oil based products from hardening in the can.
A:
positive