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Yes, you can seal old or existing concrete, but proper preparation is crucial. The concrete surface must be clean, dry, and free of any incompatible old sealant. To check if an old sealer is present, drip a few drops of water onto the surface; if the water is absorbed in under five minutes, it's ready to be resealed. If you plan to use the same type of sealer that was previously applied, you may not need to remove the old layer. However, if you are using a different type of sealer, the old one must be completely removed. Before applying the new sealer, thoroughly clean the concrete and repair or fill any cracks to ensure a smooth, well-prepared surface.

The amount of paint needed to cover a two-car garage floor depends on the surface area and the product's coverage rate. On average, a standard two-car garage floor measures 400 to 500 square feet. Coverage ranges from 100 to 200 square feet per gallon for epoxy paint, depending on the product and application method. After some quick math, you may need 2 to 5 gallons of epoxy paint with two coats to cover a two-car garage floor. 

Epoxy coatings for concrete basement or garage floors are popular. These two-part resinous coatings are waterproof and highly durable, making them an ideal choice for high-traffic spaces or areas where spills are likely. However, epoxy flooring costs more to apply than concrete stains and doesn't produce a natural-looking finish.

Polished concrete floors also have downsides. Some homeowners, for example, might dislike the coldness of the material (though area rugs can help warm up the space). Concrete floors are also hard, which isn’t always ideal for children and pets. What’s more, these floors are susceptible to cracking, and repairs can be costly. Some homeowners might not like that installation isn’t DIY-friendly.