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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.

While you shouldn’t use thinset mortar on its own as a floor leveler, it can work alongside other products to help level floors. For instance, you could start with a self-leveling compound, let that dry, then apply backer board with thinset mortar to help fully even out the floors ahead of laying tile.

It’s important to weigh the advantages and disadvantages of epoxy garage floor coatings. Consider the following pros and cons of this garage addition, including the following:

Pros:

• Increased visibility

• Durability

• Long lifespan

• Low maintenance

• Versatile appearance

• More sustainable

Cons:

• Strong odor when applying

• Difficult to remove

• Can be slippery

• Possible bubbles and blisters

• Temperature sensitive while curing

Whether it's better to stain or paint concrete depends on your budget, desired aesthetic, and DIY skill level. Generally, staining is a more durable option because the stain soaks into the concrete's surface and won't wear away like a topical paint coating. Painting concrete can trap moisture underneath the paint layer, which may cause the concrete to deteriorate over time. However, concrete paint offers a wider variety of colors, is typically easier and less expensive to apply, and is effective at covering up existing stains or blemishes on the surface.