Paint-roller cover makes a great contour sander
The graceful curves of some projects aren't well-suited to sanding with a power contour sander. To sand these contours, I wrap a piece of sandpaper around an old (but still soft) paint-roller cover. The nap of the roller gives plenty of cushion and contours itself to the workpiece. Use a 4"-long roller or cut a longer roller to fit. For tighter curves, use a smaller-diameter trim roller.
—Jan Svec, WOOD® magazine staff