GREAT STUFF Pond and Stone is the easy way to create beautiful aquascapes and hardscapes. By expanding to fill gaps and cracks, our foam filler helps direct the flow of water in waterfall,pond and streambed construction to the exterior of the water feature, instead of between or behind rocks. From the Manufacturer --------------------- GREAT STUFF Pond & Stone is a polyurethane-based foam adhesive designed for use in water features. By expanding to fill gaps and cracks,it works as a water-resistant sealant to help direct the flow of water in waterfall,pond and streambed construction to go where you want it to go,not under or behind rocks. The foam is black to blend in among the stones and shadows. It cures in 8 hours to create a water-shedding bond for stone,rock,masonry,concrete and most other building materials. It's perfect for water features from fountains to koi ponds because it's safe for fish.
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