What is the “open time” for HT adhesive?
The “open time” (or period from spreading the adhesive to when the last tile must be laid) is 30 minutes. As soon as you have finished spreading the adhesive you can start laying tiles and the last tile must be fitted a maximum of 30 minutes after the adhesive was spread. Exceeding this time will impair the transfer of the adhesive to the back of the tile and ultimately the bond and performance. This is VERY important.
