Selecting the correct sealant depends heavily on whether the application will be exposed to sunlight and weathering. Some applications require long-term UV stability, while others are concealed or protected and do not require UV-resistant chemistry.

When UV Stability IS Required

UV-stable sealants should be used in applications exposed to direct sunlight or long-term exterior weathering.

Typical Applications

  • Window and door perimeter joints
  • Exterior façade joints
  • Flashing and waterproofing details
  • Siding applications
  • Exterior transportation and industrial assemblies
  • Visible exterior joints

Recommended Product: XtraBond®9500 Advanced Polymer Sealant

XtraBond®9500 is designed for exterior exposed applications requiring:

  • Weatherability
  • UV resistance
  • Flexibility
  • Strong adhesion
  • Paintability

Its advanced polymer technology makes it ideal for long-term outdoor sealing applications.

When UV Stability Is NOT Required

UV resistance may not be necessary when the sealant is concealed, covered, or installed in protected interior environments.

Typical Applications

  • Hidden construction joints
  • Behind cladding or trim
  • Interior industrial sealing
  • Concealed waterproofing details
  • Protected bonding applications

Recommended Product: XtraBond®9500NC General Purpose Advanced Polymer Sealant

XtraBond®9500NC is ideal for concealed or protected applications where UV exposure is not expected.

The product provides:

  • Aggressive adhesion
  • Flexibility
  • Durable sealing performance
  • Low VOC formulation

XB9500NC should not be used in applications exposed to prolonged UV or sunlight.

Product Selection Summary

Use XB9500 When:

  • The joint is exposed to sunlight
  • Exterior weatherability is required
  • Appearance retention is important

Use XB9500NC When:

  • The joint is concealed or protected
  • UV exposure is not expected
  • Interior or hidden sealing is required

Conclusion

Understanding whether a sealant will be exposed to UV light is critical to proper product selection. For exterior exposed applications, XtraBond®9500 provides the UV stability and weatherability needed for long-term performance. For concealed or protected applications, XtraBond®9500NC offers excellent sealing and adhesion performance where UV resistance is not required.