To ensure the best results when using Wondercide, you should only need to reapply after heavy rainfall. Our solution is designed for outdoor use but is not waterproof. Heavy rains (where you can see standing or flowing water on the ground) may wash some of the product away which could affect repellency, but trust that your application has still killed any pests by contact.
The outdoor solution can withstand lighter rain or regular sprinkler use but if you’re expecting storms, it’s best to hold off applying until clearer weather is in the forecast.