Case 3
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Introduction
Sealant Staining
Type of Building: Industrial Building
Streakings was observed coming down from joints. Other than dirt following the rainwater run-off, the streaking was also a result of the deterioration of sealant due to leaching.
The migration of fluids (plasticizers, unreacted or unreactive polymers, antioxidants, or other liquid formulation additives) out of a sealant and into a porous or microporous substrate causing a dark band (“wet look”) around the joint.
See also: Sealants in the Material Manual