The two most widely used products available for windshield repair are urethane and silicone based sealants. Deciding which to use depends entirely on the type of damage needing repaired.
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A water-resistant liquid compound, urethane is used by auto manufacturers to glaze windshields. It is also used in the aftermarket repair and replacement of windshields. Very odorous, urethane comes in a can and requires a brush for application.
A water-resistant glue-like substance, silicone comes in either a tube or caulking gun. It's nearly odourless and can come in clear or white. It is used to either repair a leak in the seal of a windshield or in the installation of a new one.
Urethane vs. Silicone
Both urethane and silicone can be used to install a new windshield or repair the seal on an existing one. Urethane sealants take a week to cure, while silicone cures within hours. As a water based substance, clear drying urethane is also used to repair minor dings and cracks. Silicone is not recommended for crack repair because it is a thick substance that is not completely clear.
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