SPG-1 MED DIMENSION SPONGE - CBD GROUP DUTCHBOY MARTIN SENOUR by Dutchboy. $1.98. The Dimensions, by Dutch Boy is a natural sea sponge and is a 100% biodegradable, environmentally safe, quickly renewable natural resource. Perfect for creating a variety of effects on walls, furniture and other surfaces. Can be used with latex, acrylic and oil based paints or glazes. ( label provides helpful hints).