Generally after 24 hours water maintenance. But it is best to look at the temperature and humidity to match. In winter, when the temperature in the north is less than 10 degrees, outdoor construction is not suitable, and indoor insulation and moisturizing should be paid attention to; In winter, if the temperature in the south is not less than 10 degrees, both indoor and outdoor can be constructed, but pay attention to moisturizing. When the wall has a hard film (touch with your fingers), you can usually start spraying with a watering can. Be careful not to scrub vigorously.