Because unsealed concrete is porous, it readily absorbs liquids, leading to unsightly stains and freeze-and-thaw cycle damage. For this reason, it’s important to seal concrete that will see spills or outdoor weather.
The best option for garage floors and other high-traffic areas is epoxy, which forms a hard and extremely durable surface on top of concrete. Epoxy, acrylic, and polishes are often used on indoor floors, while acrylic-resin sealers and reactive penetrating sealers are used on outdoor surfaces to repel water and salt. Locate a concrete contractor in your area to help find the best solution.