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BOSS® MS 40+ is a high-performance, one-component, hybrid polymer sealant. It takes the place of most traditional sealants and is designed to resist all on-the-road flexing and vibration. The product is fast curing and provides permanent elastic adhesion to most surfaces with excellent elasticity.


  • Can be painted with water-based systems within 30 minutes.
  • Ecological advantages – free of isocyanates, solvents, halogens, and acids.
  • Excellent adhesion on nearly all surfaces, even if slightly moist.
  • Good colour stability, weather, and UV resistance.
  • Good extrudability even at low temperatures.
  • High elasticity.
  • Ideal for use on sensitive porous or non-porous substrates, susceptible to plasticizer migration of contamination.
  • No bubble formation within sealant in high temperature and humidity applications.
  • Very good mechanical characteristics.


  • Bonding applications in industrial, construction, and automotive industries.
  • Connection joints in sheet metal fabrication, sealing of air conditioning systems.
  • Sealing of floor joints.
  • Strong and elastic bonding in constructions that are prone to vibrations.
  • Supple bonding in car bodies, caravans, and containers.


This product is available in clear.


Available in 290 ml cartridge, 600 ml sausage, and 250 kg drum packs.


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