Why would I use double-sided discs instead of standard single-sided floor sanding discs?

Double sided discs make hard plating simpler and easier by eliminating the need to mechanically fasten the disc to the bottom of the buffer. When using single sided large discs in hard plating, it is recommended to apply two discs at a time making sure the slots at the center hole of each disc are offset. This will help prevent the disc from prematurely tearing at the center hole.