All, I am about to start a job and plan on using Ditra 25 over concrete. Talking to my local, very good supplier, he has suggested I try a new Ardex product under the Ditra matting. I didn’t get the name but he described it as like a sticky glue that can be troweled directly onto ‘crete before laying out matting. Has anyone used a “glue” type product under matting ?, I have previously only used thin set under matting !. Any thoughts ?!.