Direct the flow of water over the rocks in your stream or waterfall with Atlantic Black Foam. This convenient, black colored polymer expands to form a waterproof seal in cracks or voids between rocks and most construction materials. The foam's easy-to-use can makes installation simple. Just attach the straw, point to the void you want to fill, and press the dispenser. Allow plenty of room for the foam to expand by filling the cracks only 40% full. Foam will settle in and fill these gaps, and its black color discretely blends with liner and rocks. This foam is perfect for filling and sealing holes in a variety of applications such as securing stone edging or containing gravel on bog shelves. The foam dries quickly for ease in trimming and cleaning, and is safe for ponds containing fish and plants. Each can delivers about 950 cubic inches of cured foam.

AWG Black FallsFoam 12oz Can