watermark on tiles

[longdogs]

Hi.

Just finished tiling a bathroom and starting to grout when I noticed that a feint grey watery mark has appeared on the front of the tiles., wherever the adhesive has been spreadon the back. The tiles were bought from B&Q - cheap as chips and are plain white. One tile which was standing on a damp towel absorbed the water and also gained this mark. I am now worried that the mark will be permanent or is it just a case of drying out? The walls were unibonded. I would have thought that in this current heat they would have dried in a couple of hours. Would be grateful for any suggestions.

Thanks

 

[longdogs]

No answers for this one then? No, I've never seen it before either

 

[Nige F]

Not an expert But would suggest the unibond is forcing the adhesive to dry through the front and being cheap tiles has allowed this to happen

 

[longdogs]

Yeah! Sounds like it could be the problem

Thanks Nige