I`d approaching counsel please (re stoneware wall tile glue.? i have a 16kg tub of `sovereign terracotta wall tile adhesive` ive...

i have a 16kg tub of `sovereign terracotta wall tile adhesive` ive had this tub for 3 yrs ( kept contained by storage) I opened it tonight & within was a gummy crud on the top, i scooped the thick away & the bottom partly seems ok (its still soft & oily) would this be okay to use on my terracotta wall tiles or will i have problems next to it?.. thanks
One of my upstairs rads is constantly airlocked...
Answers:    Don't use it. Once the sticky stuff is altered...(the crud has separated from the base) the product is no longer apt. Get rid of it and start new.
How do I sew through extremely gummy material??
I wouldn't use it. What if it fail? Then you've just fruitless time and money.