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Bentoseal is a trowel grade sodium bentonite/ butyl-rubber compound designed for a variety of surface preparation and waterproof detailing work with the Volclay Waterproofing System. Because Bentoseal contains bentonite, it swells upon contact with water to seal against water intrusion. Bentoseal has the consistency of thick grease and easily applies and bonds to most substrate materials.
Bentoseal is a below-grade waterproofing accessory product designed for use on structural concrete, masonry, wood and most metal surfaces.

Examples of application are