We can report that the repellent works against snakes and other pests as described. The action is possible because of the combined effects of its ingredients, naphthalene and sulfur. Together, they emit an odor that deters the reptiles immediately after the initial application. However, bear in mind that the former is the main chemical found in another insect control product, mothballs.
There is a noticeable smell when you use it. In fact, it’s the means by which the manufacturer suggests you apply it again. Once it dissipates, it no longer is effective. Another concern is that they recommend not using it if you have outdoor pets. These factors put it in the dealbreaker category for some individuals.
On the positive side, it can also deter other animals such as rodents. That will remove a vital food source for some snakes and further add to the product’s efficacy. We suggest that you weigh the pros and cons carefully to make an informed decision about whether it is right for you and your situation.