a corner sander base including a sanding surface , the corner sander base for sanding proximate interior wallboard corners , the corner sander base including a first member and a second member connected together at a longitudinally oriented juncture where they form a tip , one side of the members defining a sanding surface . each member further includes a planar forward section which in the radial direction originates at the juncture and terminates at a longitudinally oriented transition wherein a forward angle is the angle subtended between the planar forward sections in the radial plane . each member further includes a planar rear section originating at the transition and connected to the forward section at the transition wherein a rear angle is the angle subtended between the planar rear sections in the radial plane and wherein the forward and rear angles selected to more aggressively sand the areas at the rear sections and less aggressively sand the area at the tip and forward section .