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The cost to seal concrete is around $1,500 on average, but you could spend anywhere from $1,000 to $7,000, depending on the type of sealer used and the size of the space. You may want to seal concrete that receives a large amount of foot traffic or heavy wear. While you can seal concrete yourself with materials from a home improvement store, you must ensure the surface is clean and ready to accept the sealer. Hiring a professional is often recommended to ensure good, even coverage that provides adequate protection.

If your concrete stains are green in color, it indicates the presence of mold or algae—which you should address right away. If left unattended, mold will spread to other areas throughout the home. However, be careful not to disturb mold on indoor concrete surfaces and work with a local mold remediation specialist for specialized care. Once free from mold and algae, seal your concrete to eliminate pores and gaps.

Spills like water, oil, or grease can wear down the epoxy's strength, lowering its lifespan. While this damage doesn’t happen immediately, it can accumulate over time, so cleaning up any garage spills as soon as they happen is essential. Avoid cleaning with or using dish soap on your epoxy floors since they will leave an unattractive residue. Instead, you can use half of a cup of ammonia diluted with a gallon of water for cleaning purposes.

Sealing the concrete before tiling is recommended to help it stand up against any water that may seep through the tiles or grout. After thoroughly cleaning the concrete with TSP, priming with a concrete primer will seal the concrete. Check the label on the primer to make sure it is also a sealant and follow the manufacturer’s instructions for application.