Certified Business
With over 100,000 orders
With over 100,000 orders
GURU W-S Waterproof Sealant and Adhesive
Fast Shipping
Easy Returns
Secure Checkout
Recommended Add-Ons
You May Also Need
GURU USA
GURU W-S Band Peel & Stick
Self-Adhesive Waterproofing Band for Wall Seams and Corners
$121.16
At a Glance
Quick Decision Guide
Sealant Type
MS Polymer
Cartridge Size
9.8 fl oz
Coverage
Up to 72 ft with a 0.16" Bead
Application
Waterproofing Systems
Flexible After Cure
Yes
Wet & Humid Cure
Yes
UV Resistance
High
Interior & Exterior
Yes
Why Choose This Product
Key Benefits
Sealant and Adhesive
Seals waterproofing joints while bonding compatible materials
WATER-STOP Compatible
Designed for WATER-STOP products and complementary drains
Compatible Materials
Bonds to wood, metal, PVC, aluminum, and brass
Flexible Joint Sealant
Remains flexible after curing to accommodate movement
Cures in Wet Conditions
Cures in wet and humid environments
Interior and Exterior
High UV resistance supports indoor and outdoor use
Product Information
Product Details
Specifications
Brand
GURU®
Part Number
IGU6400
UPC
8436540762849
Product Type
Waterproof Joint Sealant
Sealant Type
MS Polymer
Cartridge Size
9.8 fl oz
Coverage
Up to 72 ft with a 0.16" Bead
Primary Applications
Seams, Corners, Transitions & Penetrations
Application Areas
Waterproofing Systems, Showers, Wet Rooms & Structural Construction
Compatible Materials
Wood, Metal, PVC, Aluminum & Brass
Flexible After Cure
Yes
Wet & Humid Cure
Yes
UV Resistance
High
Chemical Resistance
Diluted Acids, Alkalis, Saline Solutions & Soapy Water
Silicone-Free
Yes
Low Odor
Yes
Non-Staining
Yes
Incompatible Surfaces
Rubber, EPDM & Bitumen
Interior/Exterior Use
Yes
About This Product
Sealant and Adhesive for Waterproofing
GURU® W-S Sealant is an MS polymer sealant and adhesive for waterproofing seams, joints, corners, transitions, penetrations, and drain connections. It creates a durable, flexible bond for showers, wet rooms, and other moisture-exposed interior and exterior applications.
Waterproof Sealant for WATER-STOP Products
W-S Sealant was developed for WATER-STOP products and complementary drains, making it a direct fit for GURU waterproofing assemblies. Its use is not limited to WATER-STOP components, and it can also seal and bond other compatible waterproofing products and construction materials.
Adhesive Sealant for Compatible Materials
The adhesive sealant bonds to wood, metal, PVC, aluminum, brass, and other compatible materials. Its silicone-free MS polymer formula remains flexible after curing, helping it accommodate movement while providing adhesion and joint sealing in one product.
Flexible Joint Sealant for Wet Conditions
W-S Sealant cures in wet and humid conditions and offers high UV resistance for indoor and outdoor use. After curing, it resists diluted acids, alkalis, saline solutions, and soapy water. One 9.8 fl oz cartridge provides up to 72 linear feet of coverage with a 0.16" bead.
Product Resources
Documentation & Downloads
Common Questions
Frequently Asked Questions
What is GURU W-S Sealant used for?
GURU W-S Sealant is used to seal and bond seams, joints, corners, transitions, penetrations, and drain connections in waterproofing assemblies. It was developed for WATER-STOP products and complementary drains, but its MS polymer formula can also be used with other compatible waterproofing components and construction materials.
Can W-S Sealant be used without WATER-STOP products?
Yes. W-S Sealant was designed for WATER-STOP products and complementary drains, but it is not limited to that system. It can serve as a waterproof sealant and adhesive with compatible construction materials in showers, wet rooms, and other interior or exterior waterproofing applications.
Is GURU W-S Sealant both a sealant and adhesive?
Yes. The MS polymer formula provides both sealing and adhesive performance. It can create flexible joint seals while bonding compatible waterproofing components and building materials. This combination makes it useful for waterproofing details where a durable bond and a flexible seal are needed in the same application.
What materials does GURU W-S Sealant bond to?
GURU W-S Sealant bonds to wood, metal, PVC, aluminum, brass, and other compatible construction materials. Surface preparation can affect adhesion, so each surface should be clean and prepared for the application. The manufacturer does not recommend using the product on rubber, EPDM, or bitumen surfaces.
Can W-S Sealant cure in wet conditions?
Yes. W-S Sealant can cure in wet and humid conditions, making it suitable for moisture-exposed waterproofing work. The applied surfaces should still be prepared according to the installation requirements so the sealant and adhesive can develop a durable bond and maintain a flexible seal after curing.
Is GURU W-S Sealant suitable for exterior use?
Yes. The waterproof sealant has high UV resistance and is suitable for both interior and exterior applications. It can be used in showers, wet rooms, and other compatible waterproofing assemblies where exposure to moisture, humidity, or sunlight requires a flexible and durable joint sealant.
How much coverage does one cartridge provide?
One 9.8 fl oz cartridge provides up to 72 linear feet of coverage when applied as a 0.16-inch bead. Actual coverage will vary with bead size, joint dimensions, surface conditions, and installation technique. Larger beads and deeper joints will reduce the total coverage available from each cartridge.
Is GURU W-S Sealant silicone-free?
Yes. GURU W-S Sealant is a silicone-free MS polymer sealant and adhesive. The low-odor, non-staining formula remains flexible after curing and resists diluted acids, alkalis, saline solutions, and soapy water. It provides an alternative to silicone for compatible waterproofing, joint sealing, and bonding applications.