- Features & Benefits: Bonds with rock, stone, wood, and most aquarium and pond materials Comes in two color; grey and brown that blends into shadows Won’t discolor like conventional foam – no painting needed Expands to fill gaps and voids Easier and less expensive than stones/rock Superior adhesion Fills holes in trees to seal out pests Use as a craft foam for artificial plants After use lean the applicator nozzle immediately with acetone to prevent clogging