Grout is cement, sand & a liquid, the liquid starts the process of the cement & sant setting from a powder to a solid.
Traditionally it was WATER that was used as the liquid
newer grouts substitute Epoxy as the liquid, making the grout set harder stick together better and resist stains
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Urethane is a type of sealant used in grout to provide additional protection and durability. It helps to make the grout resistant to stains, water, and chemicals, extending the lifespan of the grout and making it easier to clean and maintain.
Urethane, also known as ethyl carbamate, is a chemical compound that can be produced synthetically or be found naturally in fermented foods and alcoholic beverages. Industrially, urethane is commonly produced as a byproduct in the production of ethyl carbamate-based chemicals.
The density of Urethane typically ranges from 1.1 to 1.2 grams per cubic centimeter (g/cm3).
New grout will not bond well to old grout because the surface of the old grout may be too smooth or uneven to create a strong bond. It's recommended to remove the old grout before applying new grout for a better adhesion and more consistent finish.
To clean grout, you'll typically need a grout brush, a mild cleaning solution (such as water and vinegar or a commercial grout cleaner), a bucket of water for rinsing, and a towel for drying. Protective gloves and goggles are also recommended when working with cleaning solutions.
Sevin Concentrate is actually an insecticide used in gardening. It is not meant for use in grout. If you are looking to clean grout, you would typically use a grout cleaner or a solution of vinegar and water. Follow the instructions on the cleaning product for the proper dilution and application method.