Sealant Staining

Sealant Staining
(Source: Law, 2016)

Yellowish (left photo) and whitish (right photo) streaks are observed to originate from the sealant used. Glass tends to attract holds a molecular layer of moisture on its surface which traps dust and dirt. Usage of sealant further attracts more dirt. Due to the hydrophilic nature of TiO₂ coating, the film of layer might not be able to form on the substrates to wash off the dirt, resulting in sealant staining observed.