A screen protector which has been used for a long period of time may have scratches or dirt on it, and could have lost much of its water resistance. Be sure to change the screen protector periodically. Schneider Electric recommends yearly replacement (or when scratches or dirt become visible). 

8.4” models	MPCKT12NAX00*	MPCYK10SPSKIT
12” models	MPCKT22NAX00*	MPCYK20SPSKIT
15” models	MPCKT55NAX20*	MPCYK50SPSKIT