No, unfortunately it isn't. Getting accurate results requires the sensor be exposed to as much air as possible within your space. This means that sealing the unit and making it waterproof only makes it that much more difficult to get air to the sensors. If you look at closely at the sensor there are small holes near the edges on both sides, which allow for air to get into the case. Unfortunately these same holes can also allow water in so the unit is not considered waterproof/water resistant. It's best to move the sensor if spraying any liquid in the space as water damage is not currently covered under our warranty.