Concrete Sealer vs. a Floor Coating: Which One Does Your Michigan Concrete Need?

Quick answer: A concrete sealer soaks into or sits thinly on bare concrete to slow down water and salt. It's inexpensive, but it wears off and has to be reapplied. A full floor coating is a thick, bonded surface that covers the concrete completely. For a garage or basement you want to keep clean for years, a coating does more. For a driveway or sidewalk you just want to protect, a good sealer is often enough.

Walk down the concrete aisle at any hardware store and you'll see dozens of sealers promising to "protect" your floor. Meanwhile, coating companies talk about floors that last for decades. They sound like the same thing. They aren't. Here's how they differ, what Michigan winters do to each one, and how to decide which your concrete actually needs.

What a concrete sealer does

A sealer is a thin, clear product that slows down how much water, salt and oil soak into concrete. There are two main families:

• Penetrating sealers (silane, siloxane and silicate products) soak into the top of the concrete and react inside the pores. They don't change the look much and don't leave a film you can see. Water beads up on the surface instead of soaking in.
• Film-forming sealers (most acrylics) leave a thin layer on top. They can add a slight sheen or "wet look" and help with surface stains. Because they sit on the surface, they scuff and wear in high-traffic spots and under tires.

For outdoor concrete in a freeze-thaw climate, penetrating sealers are the go-to. The Pennsylvania Aggregates and Concrete Association notes that silane and siloxane penetrating sealers provide "the highest level of resistance" to deicer and freeze-thaw damage (PACA guidance on protecting concrete from deicers).

What a sealer can't do

A sealer doesn't hide anything. Stains, pits, cracks and spalled patches stay right where they are. It doesn't make concrete easier to sweep, and it won't stop dust from coming off an older garage slab. And because it's thin, it wears. How often you reapply depends on the product and the traffic, so follow the manufacturer's label.

What a floor coating does

A professional floor coating is a different kind of product. Instead of a thin treatment, it's a complete new surface that bonds to the concrete.

At Fortified, that means a 100% solids polyurea base coat, a full broadcast of decorative flake, and a UV-stable polyaspartic topcoat. Before any of that goes down, the concrete is diamond ground so the coating can bond to it permanently, and cracks and pits are filled and smoothed flush.

The result:

• Concrete is completely covered. Salt brine, oil and melted snow sit on top of the coating instead of soaking into the slab.
• Old damage disappears. Stains, pitting and repaired cracks are hidden under the new surface.
• It's easy to clean. A non-porous floor wipes up with a mop. No more dust coming off the concrete.
• It's slip-resistant. Anti-slip additives in the topcoat help when the floor is wet.
• It's warrantied. Our coatings carry a manufacturer lifetime warranty against UV fading and a 15-year manufacturer warranty against chipping, peeling and delaminating.

How each one handles a Michigan winter

Michigan concrete gets a hard workout. Snow and slush drip off your car, road salt rides in with them, and the garage freezes and thaws over and over between December and March.

On bare concrete, salty water soaks into the pores. When it freezes, it expands, and over a few seasons the top layer starts to flake and pit. That's called scaling, and it's why so many older Downriver garages have a rough, crumbly patch right where the car sits. We cover how that happens in what road salt is doing to your garage floor.

A sealer slows this down. A fresh penetrating sealer keeps a lot of that water out. But it's working against constant tire traffic and salt every day, so its protection fades and needs renewing.

A coating takes the concrete out of the equation. The salty water never reaches the slab. You squeegee or mop it off the surface. The concrete underneath stays dry and protected.

Side-by-side

So which one do you need?

Choose a sealer if:

• It's a driveway, sidewalk or other large outdoor slab where you mainly want to slow down salt damage.
• The concrete is in good shape and you like how it looks.
• You're comfortable reapplying on a schedule.

Choose a coating if:

• It's a garage, basement, patio, porch or shop floor you use every day.
• The concrete is already stained, pitted, dusty or flaking.
• You want a floor that looks finished and stays easy to clean.
• You'd rather do it once than keep reapplying.

Watch out for "sealer" products sold as coatings. Some roll-on kits are labeled as floor coatings but go on so thin they behave more like a sealer or paint. They often lift under hot tires within a season or two. We explain the difference in garage floor paint vs. a professional coating and why garage floor coatings peel.

A few things to know before you do either

• New concrete needs time. Don't seal or coat a brand-new slab right away. See coating a new concrete garage floor for timing.
• Sealers and coatings don't always mix. If your floor has an old sealer on it, a coating can't bond to it until it's ground off. That's one reason diamond grinding is part of every Fortified install.
• Moisture matters. If water is coming up through a basement slab, neither product fixes that. Solve the water first. Our basement floor coating guide explains how to check.
• Read the deicer bag. Some ice melts are much harder on concrete than others. Products with ammonium nitrate or ammonium sulfate are especially aggressive, according to the PACA deicer guidance.

Frequently asked questions

Not sure what your floor needs?

Joe will walk your concrete with you, look at its condition, and tell you honestly whether a coating makes sense or a sealer will do the job. Book your free in-home estimate or see what's possible on our residential floor coatings page.