Due to the fact, that weathermen are often wrong, we usually keep jobs scheduled and evaluate the weather on the day of treatment. If it is raining we will not treat the outside of your home. The product does need time to dry after application in order to set up properly. However, if any inside work is needed, we will usually keep the scheduled appointment to complete the inside portion of the work. We will then reschedule the exterior portion of the treatment for the next available date we are in the area. As many of our customers are busy with work, family, and hobbies, we have found that this method works best for both the customer and our scheduling efficiency.