Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Helpful tips - great stuff

This is great stuff. I'm passing along two good tips from my local shoe repair expert. First, it does darken some leather. For my hiking boots and many other items this is not a problem, in fact it improves the appearance of the leather. But if that's a concern to you be sure to test it on your item first. Second, instead of "wiping off the excess" as the package directions indicate, use a hair dryer to lightly warm the leather and the paste will sink right in. This creates a better waterproofing seal and the item is ready to be used again in minutes.