Wet Sanding with Dura-block or paint stick?

I used Durablock with mine. I used the adhesive backed paper to 320 grit. Then wet sanded at 400 then 600. Then 3 stage paint base,pearl, clear. No problem using the Durablock with non adhesive backed sandpaper as long as you have enough to wrap around the block so you can grip it to the block.