AquaForte Expanding Landscaping Foam 500ml is a black expanding foam made of polyurethane. It is designed for use as a filler around ponds and waterfalls, and for creating backgrounds in aquariums and terrariums. This foam expands uniformly and adheres to various surfaces including stone, cement, wood, fabric, and rock. It is UV resistant, ensuring color stability even in direct sunlight, and is safe for use around fish and plants. The product comes with an applicator tube and is easy to use.