i installed Corian countertops in four bathrooms in my home.. I used a silicone adhesive to mount the backsplash and side splashes to the drywall walls. I used Liquid nails to adhere the top to the cabinets. The underside of my countertops was built up with particleboard strips and the is the part of the countertop that sat on the cabinet top. I used a dab of this every 6 inches.. haven't had any problems yet.