A new and unique x Mangave plant named ‘；Sponge Paint’； characterized by a rounded mound of oblanceolate to rhombic, fleshy, slightly-rough leaves that develop silver-gray coloration with small wine-colored spots in strong ultraviolet light. Leaves have medium-sized, sharp, firm marginal teeth and firm, sharp, apical spine. The new plant is suitable for the garden or as a potted plant in the garden or home.
