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Yes, you can seal old concrete, but proper preparation is essential. Before sealing, ensure the concrete is clean, dry, and free of any old sealant. To check if resealing is necessary, place a few drops of water on the surface; if they are absorbed in less than five minutes, it's time to reseal. If you are using the same type of sealer that was previously applied, you may not need to remove the old layer. However, if you are applying a different type of sealer, the existing one must be removed. Additionally, repair or fill any cracks to create a smooth base before you begin sealing.

Epoxy coatings for garage floors offer a variety of finish and design options, including:

• Decorative colored flakes: $10 per 250-pound bag

• Metallic epoxy: $5–$12 per square foot

• Rock or stone epoxy: $100 per gallon

• Acrylic and poly-acrylic sealants: $0.85–$1.15 per square foot

• Polyurethane sealant: $0.95–$1.10 per square foot

• Polyurea sealant: $150 per gallon

You can seal a concrete slab by cleaning the surface, filling in any cracks, etching the surface, applying a sealer, and letting it dry. Concrete slabs don't typically need sealing, but you can use a topical concrete sealer if you notice signs of water damage. If you haven't already fixed the cause of the leak, then you'll want to repair the plumbing before you seal a concrete slab.

Epoxy flooring is used in many outdoor applications. Pebble epoxy flooring, in particular, is a great choice for most areas like porches, patios, and walkways. It adds visual appeal while adding texture using natural materials. The surface, however, can be slick when wet. Consider adding a non-slip additive if the area gets heavy foot traffic or if you live in a wet climate.