I found this Life Pro Tip via Reddit and thought it was cool:

Make your sandpaper last ten times longer by putting duct tape on the back – I do a lot of woodworking, and got sick of sandpaper wearing out or tearing after only a bit of use. So I started putting duct tape on the back, now it lasts forever, almost.

And then in the comments I found this nifty idea for cleaning sandpaper.  I don’t think the video has any cursing, I just skimmed it.