Concrete Densifiers: Look for silicate sealers, either in a sodium, potassium, lithium or carrier.  They are available in both concentrated and ready to use formulations and are excellent for hardening, densifying and polishing concrete. If the formula is concentrated make sure to price out the cost per gallon after dilution. If the formula is ready to use make sure it is at a better price point than a concentrated solution. Keep in mind silicate densifiers do not waterproof concrete. Best for use on warehouse floors.

Concrete Waterproofing: Look for silicate/siliconate blends especially of a lithium carrier. Will densify and waterproof concrete all-in-one through penetration and a chemical reaction with the carbon dioxide in the air. Creates a hydrophobic barrier resistant to water and chemicals. Best for use on basement foundations.

Concrete Water Repellents: Look for silane/siloxane blends of a high percentage of solids, look for at least 20%-40% silane/siloxanes. Best for waterproofing extremely porous concrete blocks and concrete cinderblocks. Also excellent choices for municipality jobs.

Decorative Sealers: Look for acrylic sealers of either a water based or solvent based formulation. Water based sealers will leave a natural to satin sheen while solvent based sealers will leave a high gloss sheen. Make sure if you purchase a solvent based sealer it meets the VOC regulations of your state.  Best for concrete patios, pavers and driveways.

Coatings: Encompasses epoxies, urethane and polyaspartics. By using a urethane or polyaspartic in conjunction with an epoxy you are adding longevity and added chemical resistance properties. Polyaspartics provide similar benefits to urethanes but they are faster drying. Make sure you have a concrete slab with a rough surface porosity before applying a coating in order for the coating to adequately adhere to the concrete. Best for garages, warehouses and high chemical exposure areas.