Rock Glue for Landscaping - 2 Gallon Mulch Glue, Gravel Binder & Stone Adhesive, Fast-Dry, Non-Toxic, Weather-Resistant for Patios, Garden, Walkways and Paths. 【Easy to Use & Fast-Dry】MOLYLY Rock Glue can be applied directly to the surface of mulch materials such as gravel and pebbles by spraying or mixing.