Seal-it® 335 HYBRI-STOP

Seal-it® 335 HYBRI-STOP is a high-quality, elastic and universally paintable putty for sealing and filling of heritage glass, that is based on hybrid technology and moisture-cures into a durable rubber that retains its elasticity.



  • Specially designed as a putty that retains its elasticity, for application of seam seals for single-pane, insulating and heritage glass, in wooden, steel and concrete frame rabbets.
  • As a higher-quality substitute for traditional putty in heritage and public buildings, such as canal-side buildings, farmhouses, schools, station buildings, etc.
  • As an elastic filler for smoothing/levelling of surface damage, such as screw and nail holes, splits, cracks, etc., in glazing beads and other wooden parts.
  • Repair putty for damaged seals in seams, based on hybrid technology.


  • Durable, retains elasticity, fast moisture-curing.
  • Optimal paintability with water-based and synthetic paints.
  • Excellent adhesion without primer on practically all surfaces, even moist ones.
  • Superb workability using a professional caulk gun, due to the special yellow XL spout.
  • Easy to shape with a suitable jointing tool (PALU) and/or finishing block.
  • Good resistance to UV, weather, water, moisture and ageing.
  • Non-corrosive to metals.
  • Extremely low-maintenance, does not crack, split, wrinkle or petrify from drying out.
  • Compatible in direct contact with edge seals on insulating glass and PVB-laminated glass.
  • Free of isocyanate, solvents and silicone.
  • Very low emission: certified EMICODE EC1 plus.
  • Odourless, adhesive-free, bubble-free and non-shrink fast-curing hybrid system.

Application conditions

  • Application temperature (ambient and surface) between +5°C and +40°C.
  • On stable, compatible, clean, uncontaminated, grease-free and dust-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® 335 HYBRI-STOP 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.
  • Minimum dimension of the seam seal (triangular joint): 10 mm x 10 mm.
  • Use a professional caulk gun fitted with yellow XL spout, shape using a scraper and/or finishing block.
  • Use Seal-it® 550 FINISH to apply a smooth and tight finish, before skin formation.

Standard product line


12 x 600ml foil pack





RAL 7004*




* No standard stock. Available per pallet on request.

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



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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