I have a small tub of Mapei Waterproof Fix & Grout that I have opened and used a small amount from. Is it OK just to put the top back on the tub and store it for when I need the grout again or do I need to put something like cling film over the grout?
I alway cover with clingfilm, thing like tubs of ready mixed grout,artex, etc, as you can guarentee that the lid will pop off.