A clear sealer should be used when the goal is to protect a concrete surface without changing its look. Hence, a clear sealer is best used for concrete surfaces that have already been previously coated. Of course, the sealer is also fine for those surfaces that might be merely bare concrete as well.
Concrete can suffer from a tremendous amount of weather related damage and abuse. Rain, sleet, and snow can bear down on a driveway, walkway, patios, and more. Homeowners who notice a concrete surface has suffered from the very negative effects of the weather should look into purchasing a clear sealer.
Certain brands of clear sealers can be used on both interior and exterior concrete. Be sure the brand purchased can handle the environment the concrete is located.
A good quality sealer will prevent anything from seeping into the concrete and causing unwanted and, honestly, unnecessary damage. The sealer creates somewhat of a protective buffer. The liquid sealer will also soak deep down into the concrete as well as providing a protective buffer layer on its surface. All cracks and imperfections will be filled and a greater level of protection will be gained.
Again, the reason behind using a clear sealant is not to change the look of the concrete. A protective coat that does make alterations is called a stain sealant. Once stained in error, changing the look of the concrete back to the preferred look might be extremely difficult and costly, if doing so is even possible.
This must always be the main rule about selecting a clear sealant: use it when you wish to avoid changing the look of the concrete.
There are a few other things to think about when trying to make a determination as to which clear sealant to buy. Durability would be among the most critical feature. Durability refers to how long the sealant will last and provide protection. The brand selected should last several years.
How easy the sealant is to apply should also factor into the selection. Some clear sealers can be applied with a basic roller brush or, if preferred, an air sprayer. Most homeowners are likely going to be interested in buying the sealer that is the easiest to apply. The sealer should also dry within a reasonable amount of time. 24 hours should be the maximum.
Be sure not to apply the sealant on a day where rain is expected. The rain could wash away the recently applied sealant because if will not have dried enough.