Seal-it® 331 HYBRI-COAT

Seal-it® 331 HYBRI-COAT is an elastic, airtight, durable and high-quality seal coating that can be smoothed with a brush, is based on hybrid technology and moisture-cures into a durable non-shrink membrane with high mechanical strength.



  • Particularly suited for durable airtight and watertight sealing of connections and surfaces.
  • Suitable for both indoor and outdoor applications.
  • Ideal for sealing structural connections and joints in the shell construction stage.
  • Application of a watertight membrane on walls and floors in sanitary spaces and other spaces with plumbing fixtures, before tiling.


  • Durable, retains elasticity, high movement capacity.
  • Excellent adhesion without primer on practically all surfaces, even moist ones.
  • User-friendly and versatile.
  • Resistant to UV, weather, water, moisture and ageing.
  • Low viscosity.
  • Excellent workability with a brush and/or roller.
  • Non-corrosive to metals.
  • Fast-curing, non-shrink and bubble-free.
  • Paintable with water-based paint systems.
  • Free of isocyanate, solvents and silicone.
  • Very low emission: certified EMICODE EC1 PLUS.

Application conditions

  • Application temperature (ambient and surface) between +5°C and +40°C.
  • On clean, uncontaminated, dry, stable, compatible, dust-free and grease-free surfaces.
  • Use a suitable brush to remove any loose particles from the surface.
  • Degrease the surface properly using Seal-it® 510 CLEANER.
  • Seal-it® 331 HYBRI-COAT has a broad bonding spectrum, but highly porous surfaces should be pre-treated with Seal-it® 520 PRIMER and non-porous surfaces with minimal bonding should be treated with Seal-it® 525 Clean & Bond.
  • Use Seal-it® 550 FINISH to apply a smooth and tight finish, before skin formation.

Standard product line


12 x 600ml foil pack



SI-XXX-XXXX-XXX = Article number.
Other colours and/or packaging on request.


  • SKZ geprüft

Technical support department

Connect Products has a state-of-the-art R&D laboratory, where experienced specialists continuously research and develop sealants, adhesives and PU foams. Customers and clients can have products researched, tested and developed by this department. You can also contact us for technical advice, tips, project support, warranty certificates, requests and other technical questions. We will be happy to assist you with high-quality technology.

Call us on +31 (0)183 731 400 or send us an e-mail.

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