Use only 8-hole sandpaper discs that are no coarser than 80-grit. CTC might have these discs in stock for purchase by borrowers.
This sander is intended for light / moderate sanding loads (eg. plaster, filler, putty, paint) on smooth surfaces. It is not intended for use on rough surfaces or surfaces requiring heavy sanding. Please do not exert excessive downward force when using the sander, ie. no more than is necessary to control the path of the sander and keep it in contact with the surface being sanded.