Neoprene can be used either by itself or as a thin, separate layer glued to the Minicell. Gluing with Contact Cement Foam pads should be glued to your kayak with contact cement, but not all of these glues are suitable. Some brands have recently been reformulated for safety or environmental reasons. Many are not waterproof and lack holding power. Use a commercial-grade waterproof contact cement.
Contact cement can be pretty unforgiving to work with.
Two thin coats are better than one thick coat. In cold or humid weather, the glue tends to congeal and never gets sticky. You can use a heat gun or a hair dryer to get good results under these conditions. Apply heat from a heat gun if the glue has dried for too long. It will often become tacky again.