When wet sanding, how do you attach the paper to your foam sanding block? Or do you just kind of have the paper between the block and the panel. I have a few areas i am going to try to wetsand, and I have 1500, 2000 and 3000 grit 3m paper as well as a 3m fowm sanding block. It has holes on one side and is flat on the other to offer a different level of cutting power.