Sink Separating From Granite . Pull the piano wire across the seam while pushing it down into the adhesive until the helper's end reaches the countertop. In other words the glue or caulk or whatever hold it together is disintegrating. DIY Home Repair 2 Kitchen Sink Separation, Undercounter Sink on from www.youtube.com Install wooden shims underneath the countertop and above the cabinet base. Continue this sawing action until the piano wire cuts through the adhesive. Apply acetone (get at any hardware store) to a disposable rag and thoroughly clean the sink lip and underside of the stone