Unifinish at B and Q

Simple yes or no :)
Have brought it out of date yes..
Also had out of date after trials..which I used at different times,3,6,9,12,18 months.. The board finish I referred to was on a self build for a friend and he ran late,that was a disaster as it trowelled up okay in a few room's then wouldn't so I started laying in with fresh multifinish (in date) to save him money (was only a pallets worth) and the rest bonding,hardwall and multifinish I thought I'd try out of curiosity really as it intrigued me.
 
Just been to b and q Wigan and noticed all the unifinish bags had over stickers on the expiry date new date 12/08/16 date underneath 1/06/16 , surely they are out of date or am I missing something and by putting a new sticker over the top it magically extends the use by date, wonder what British gypsum have to say about that
Never use b&q plaster...always bad stuff
 
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