For reasons I don't understand, most of the 40 sculptures I've made in the past few months (that are headed for a craft show in less than a week!!) are warped. I'll worry about the "why" later, but right now I need to figure out "how" to sand the bottoms to take out the slight warpage. I have a belt sander that I can flip upside down; will that do the job with 80 grit belts? Or is my booth gonna be full of rockin' sculptures???