Abstract: Working material containers such as paint cans may be effectively stabilized from accidental dislodgment from a ladder shelf, such as a step ladder shelf, through the use of a working material container accessory. The accessory includes a flat upper support plate placed onto the top shelf surface and a lower retaining plate positioned below the shelf surface securely bolted together onto the step ladder shelf. By adhesively applying a strip of the looped member of a hook and loop fastening system to a paint container bottom and another mating hook strip onto the upper surface of the upper support plate, the paint container may be securely retained and stabilized upon the ladder shelf against accidental dislodgment or spillage. The paint container may be easily removed simply by unfastening the hook and loop straps for one another.