I'm making a radiused sanding block out of MDF for sanding some curved pieces - a qtr circle of 4.5" O.S. radius so the block will be a 4.5" concave radius. I'll glue up 4-6 layers of MDF for the block. I plan on putting 1/8" cork over the MDF then the sandpaper over the cork. I think contact cement is probably what I need to put the cork on the MDF, but am open to other suggestions. But what do I use for a temporary adhesive to attach the sandpaper over the cork? I want something that wont rip up the cork face when I need to change grits or paper and remove it. Any ideas?