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No, you cannot permanently seal concrete. The porous nature of concrete means that it’s always vulnerable to water intrusion and staining, even under the best sealants. Although some concrete sealing products can last for a long time, a genuinely permanent concrete seal remains elusive.

Epoxy paint is a popular option for concrete due to its durability and stain resistance. You can also use masonry paint, which adheres well to concrete. Acrylic paints are more affordable but not as durable. Concrete stain is another option, which is more durable than paint and won’t peel over time. 

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.

With so many vastly different options to choose from, how can you find an inexpensive garage floor that you can also confidently say is the best? The right solution will be different for everyone and truly depends on your individual needs and stylistic tastes.

If you’re working with a smaller budget, a low-cost coating such as paint, sealer, or stain might be the best way to express your style in the garage. If you need a high-performance surface that can handle the tough projects and maintenance you do in the garage, or if you want a wide range of colorful customization options, flexible tiles might be for you.