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At a Glance
Why Choose This Product
Seals WATER-STOP sheets, joints, penetrations, and drain connections
Combines flexible sealing with strong bonding in one product
Bonds to wood, metal, PVC, aluminum, brass, and other compatible materials
Remains elastic after curing to accommodate movement and vibration
Supports interior and exterior applications
Resists water, soapy water, saline water, diluted acids, and alkalis
Product Information
GURU® W-S Sealant is an MS polymer waterproof sealant and adhesive developed for bonding and sealing WATER-STOP sheets, complementary drains, seams, corners, transitions, and penetrations. It creates a durable connection where waterproofing components meet, helping maintain continuous moisture protection in showers, wet rooms, and other tiled assemblies.
The adhesive sealant bonds to wood, steel, galvanized metal, aluminum, copper, brass, polyester, PVC, and other common construction materials. Its flexible cured joint accommodates movement and vibration while providing sealing and bonding in one product, making it a versatile choice for waterproofing details and general construction applications.
W-S Sealant offers strong UV and weather resistance for interior and exterior use. After curing, it resists water, soapy water, saline water, diluted inorganic acids, and alkalis, providing dependable performance in wet-area installations and other moisture-exposed applications.
Product Resources
Common Questions
GURU W-S Sealant is used to bond and seal WATER-STOP sheets, complementary drains, seams, joints, corners, transitions, and penetrations within waterproofing assemblies. Its MS polymer formula creates a flexible waterproof connection, making it suitable for showers, wet rooms, sanitary applications, and other interior or exterior construction projects.
Yes. W-S Sealant combines adhesive strength and flexible joint-sealing performance in one product. It bonds compatible waterproofing components and construction materials while sealing the connection against moisture. This dual-purpose formula reduces the need for separate products where a durable bond and flexible waterproof seal are both required.
W-S Sealant provides strong adhesion to sheet metal, galvanized sheet, steel, aluminum, copper, brass, wood, polyester, PVC, and many commonly used construction materials. Surfaces should be free of dust and grease before application. When surface compatibility is uncertain, confirm suitability with GURU before proceeding.
W-S Sealant cures through exposure to air humidity and is suitable for moisture-exposed applications. The surfaces must still be properly prepared and free of dust and grease. Follow GURU’s application instructions so the waterproof sealant and adhesive can develop a reliable bond and flexible cured joint.
Yes. The cured sealant provides very good UV and weather resistance for compatible interior and exterior applications. It also resists water, soapy water, saline water, diluted inorganic acids, and alkalis, helping the joint maintain dependable performance in showers, wet rooms, and other moisture-exposed construction assemblies.
One 9.8 fl oz cartridge provides up to 72 linear feet of coverage when applied as a 0.16-inch bead. Actual coverage depends on bead diameter, joint dimensions, surface conditions, and application technique. Wider or deeper beads will use more material and reduce the total coverage from each cartridge.
Do not use W-S Sealant on bituminous substrates or materials that can release oils, plasticizers, or solvents. GURU specifically identifies rubber, neoprene, and EPDM as unsuitable examples. If a material is not listed as compatible, verify adhesion and suitability before using the sealant in the completed waterproofing assembly.
No. GURU W-S Sealant uses an MS polymer formula rather than a silicone formulation. It provides flexible sealing and adhesive performance while curing through air humidity. The product is intended for compatible waterproofing and construction materials, but the surface restrictions in GURU’s technical instructions still apply.
