I'm ready to repair a loose tile on my kitchen counter, and found an Un-opened can of Ceramic Floor Tile & Slate Adhesive in my garage made by Liquid Nails. It is 15 to 20 yrs old. Upon opening I noticed a dark oily liquid laying on top of the adhesive inside the can. I mixed it all in well, and left a bit out overnight to see if it hardens. After 24 hrs, it feels mushy & sticky. Is it still good?