50 lb bag. Gray. Techniseal HP NextGel Jointing Sand is a state-of-the-art mix of graded sand and binder that flows smoothly down joints for a fast and effective installation of pavers or slabs with false, narrow or wide joints. It is also recommended for surfaces exposed to heavy traffic, for high-humidity areas and concrete overlay. Easy to use, HP NextGel Jointing sand starts to set only a few minutes after being activated with water, and quickly becomes resistant to water erosion (rain, splashes, sprinklers, etc.). HP NextGel Jointing sand is the go-to solution for all installations where mechanical compaction is done. It offers great resistance to weed growth, insect invasion, and erosion. Techniseal HP NextGel Jointing Sand is manufactured with a revolutionary technology. NextGel radically transforms and improves the properties and behavior of jointing sand, resulting in the first ever true no dust, no haze and no waste jointing sand for a fast, clean, durable and profitable installation.