Rock Glue for Landscaping, 2 Gallon Concentrate Gravel Glue for Pea Gravel & Small Rocks, Upgraded Flow-Through Formula for Stronger Gravel Bond, Covers up to 300 Sq Ft, Weather Resistant. 【Upgraded Flow-Through Formula for Stronger Gravel Bond】Teexpert rock glue for landscaping is specially developed for pea gravel and small landscaping rocks, not mulch, large stones, or vertical surfaces.