Douglas from Columbia writes
For best results, you should apply Sevin Concentrate at least 24 hours before you are expecting any rain. After that point, it will be rainfast and you will not need to reapply. If Sevin had to chance to dry before that time, it is rain fast after that. This occurs likely within 6 hours if sooner you may need to reapply.
Answer last updated on: 07/22/2018