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Hi wondering if anyone can help ive tiled the passage, i bought some 12mm ply and screwed it down to the floorboards i then tiled directly onto the ply with ceramic 333/333 using mapei flexible https://www.tilersforums.com/forums/tile-adhesive/ i checked this morning and some have set and others havent ive had to pull them back up and the https://www.tilersforums.com/forums/tile-adhesive/ is like moist sand so ive scraped it off mixed up some more and re layed them is this the correct way of going about it the https://www.tilersforums.com/forums/tile-adhesive/ is taking ages to dry ive had the the front door open all day to help dry it quicker i hope it sets overnight as its becoming a headache now thanks