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Hi, the remote keypad is showing 10-t and the alarm will not arm. I have noticed the strobe is not flashing and if i open the the keypad the external sounder is silent. Is this system obsolete now? or can I upgrade, or repair it.I tried to get a installation manual from Cooper/menvier but the...

Is the normal render mixes suitable for tanking cellars ie: 4/1 sharp sand,cement.Do I need to add pva to the mix to make it water resistant,please help