Mulch Glue for Landscaping, 2 Gallon Rock Glue for Landscaping with Sprayer, Strong Adhesive for Rocks, Mulch & Gravel, Durable, Fast-Drying & Weather-Resistant Gravel Binder Max for Landscaping. Versatile Landscaping Applications: Our rock glue works seamlessly across a wide range of outdoor settings—whether you’re securing small pebbles or large rocks.