I have just used some `quick` dry flexible floor cement, Its been put on ply for floor tiles. I noticed the morning after that the bucket that had some left in it was still soft, so checked the gaps between the floor tiles and it wasnt quite hard. it has now hardened and hopefully ok now, but I am talking 36 hours to achieve this. The room temp was about 65F and I mixed roughly 1:4 as per instruction, although didnt measure accurately, but the mix seemed ok. (I have used before)
Any idea as to what may have caused this?