Box call question

[Brantleyville]

I have a box call that seems to be grabbing too much and is taking the chalk off of the paddle very quickly. What is the correct way to condition this in (top of sides or paddle) and with what grit?

[TRKYHTR]

You can take 300 or 400 grit sandpaper and lightly sand the lid length ways. Don't sand across the grain. That should smoothen the lid surface.