GAF Silicone Mastic 3.5 GAL


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Why Silicone Mastic?

GAF Silicone Mastic is a thick, high-build silicone sealant. Provides protection against leaks due to ponding water.

  • A high-solids sealant
  • Low odor
  • Brush grade for easy application
  • Fast moisture cure
  • Enhanced adhesion to a variety of substrates