A sealer is cheaper and thinner. Sometimes that's exactly right.
Sealers soak into the concrete or sit on top as a thin film. Coatings build a thick layer. Here's what each does, what each costs, and when you can skip the coating.
At a glance
| Penetrating sealer | Acrylic sealer | Epoxy or polyaspartic coating | |
|---|---|---|---|
| What it is | Soaks into the concrete. No surface film | A thin film on the surface | A thick film built up in layers over ground concrete |
| How it looks | Like bare concrete | Adds sheen and can deepen the color | Glossy, with color or flake options |
| Protects against | Water, stains and mild chemicals soaking in | Water and light staining | Oil, chemicals, abrasion and daily wear |
| How often it's redone | Installers say about 5 to 10 years | About 1 to 3 years | Depends on prep, moisture and use |
A sealer protects bare concrete from soaking up stains and water. It doesn't build a thick, hard-wearing floor. A coating does. Which one you need depends on how hard you use the garage. If you want bare concrete with no film at all, there's a third route: polished concrete.
A sealer can be enough if
Go for a coating if
Not a pitch: We don't sell either one. A sealer is sometimes the honest answer, and it costs a fraction of a coating.
A thin film scuffs and wears faster than a thick coating. One company that sells coating systems ranks sealers as the weakest garage option. That's a seller talking, so weigh it accordingly. But the thin-film point is hard to argue with.
Film-forming sealers also struggle with heat and sun. A concrete sealing contractor says acrylics on hot, sun-baked slabs tend to fail within about 18 months. Tires heated by driving can pull at an acrylic film too, much like hot tire pickup on a coating. Sealers can also turn cloudy or white, or peel, when water gets trapped under them.
None of that means sealers are bad. It means they suit a garage that gets light use.
Garage floor paint is a thin film rolled on like wall paint. It costs far less than epoxy and is easy to apply, but it doesn't build a thick, hard-wearing layer. Epoxy is applied in several steps: a primer, a base coat, often a flake layer, and a topcoat.
Concrete Network says paint typically lasts only 2 to 5 years before it needs reapplying, and that it struggles with vehicle traffic. Properly installed and maintained epoxy can last 15 years or longer. Both need a clean, prepared surface to stick.
If you already have paint on the floor and want to recoat it, the rules are the same as for any recoat. See can you repaint an epoxy or painted garage floor.
Our take: Paint is fine for a floor cars rarely touch. If you park on it every day, treat paint as a stopgap, not a floor.
| Option | Per sq ft | 2-car garage (about 450 sq ft) |
|---|---|---|
| Acrylic sealer | $1–$2 | $450–$900 |
| Polyurethane sealer | $2–$3 | $900–$1,350 |
| Epoxy | $3–$8 | $1,400–$3,600 |
| Full polyaspartic | $6–$12 | $2,700–$5,400 |
The sealer prices are national averages from one cost site, updated January 2025. The coating prices are the San Diego-area ranges we compiled from installers' published prices, checked in September 2026. Neither is a quote.
A sealer costs less up front. Because acrylic sealers are redone every few years, the savings shrink over time. See the full cost breakdown or estimate your own garage.
Installers say most coatings won't stick to a film-forming sealer. To coat a sealed floor, the sealer usually has to be ground off first. That's extra prep, and extra cost.
Some penetrating sealers are sold as compatible with later coatings. Check the product's data sheet, and tell your installer exactly what's on the floor.
A quick check: pour a little water or cleaner on the concrete. If it beads up instead of soaking in, there's probably a sealer on it. If you're heading toward a coating, see our epoxy vs polyaspartic guide before you seal anything.
A surface sealer doesn't stop moisture coming up through the slab, and a thick coating on a slab that's pushing moisture can lift. California's residential code doesn't require a vapor barrier under garage slabs, so this can happen at any age.
Whether you seal or coat, test the slab first. The questions to ask are in our contractor checklist, and we cover the local picture in our San Diego guide.
Installers use shorthand. Here's what the common terms mean, in plain English.
Keep reading
What you're really paying for. Budget vs mid-range vs premium and the hidden costs.
When a recoat works, how to handle cracks and pits, and when to grind it off and start over.
Last updated 2026-09-30. If you spot something wrong, we want to know.
The calculator uses the same published San Diego-area ranges as this page. No email needed.
Use the Free Calculator →