Alox 135 sandpaper is ideal for sanding difficult wood surfaces. The specially processed aluminum grain makes the 135 series ideal for sanding surfaces coated with putty, varnish, and primer. In addition, the specially formulated stearic coating helps to slow down chewing and prolong the life of the sandpaper. Coarse numbers are recommended for sanding putty, while fine numbers are recommended for sanding primers and varnish. There are P80, P60, P100, P150, P180, P220.