The application of the plastic hook is controlled by the user. Please use it according to the application.Ensure Surface is clean,Website:http://www.bestpakgroup.com, smooth and dry. Do not use household cleaners.Peel Backing paper, Position hook and press firmly at least 30 seconds.Wait at least 1 hours before first use. RemindBest use wait 24hours before first use.If Less than 10°C, warm the surface by the fan heater.Not suitable for application to surface over 40°CNot recommended for glass framed pictures or clocks.Do not use over beds or anywhere that may cause injury.