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BOSS® PU SL is a polyurethane sealant that is one-component and moisture-curing. Once set, it cures into a flexible, durable, and weather-resistant elastomeric sealant that has very good adhesion to most construction and industrial materials. It can accommodate cyclic joint movement of up to 50% of the joint width.


This product is available in white, concrete grey, and black.



Available in standard 600 ml sausages.



  • Excellent chemical resistance.
  • Good weather and UV resistance.
  • No bubble formation.
  • No staining on porous surfaces such as marble, granite, and other natural stones.
  • Permanently elastic after curing.
  • Self-levelling.
  • Usable up to a max slope of 3%.
  • Very easy to apply.
  • Excellent adhesion on many materials.

  • All usual horizontal building, connection, expansion, and dilatation joints.
  • Can withstand long-term intense contact-immersion (up to 1 week) in combination with Primer 100.
  • Excellent for sealing of joints in environments where fuel and oil contact can occur.
  • Resistant to splash and spillage contact from hydraulic fluids, fuels, lubricants, and oils.
  • Sealing of construction joints in concrete floors

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