Most garage floor coatings fail from the bottom up. The product on top gets the attention, but the concrete underneath decides whether it is still stuck down in three years.
How the two coatings differ
- Epoxy builds a thick, hard film that fills small surface flaws and is usually the lower-cost material. It cures slowly, so the floor stays off limits for longer, and plain epoxy can amber or yellow over time where sun reaches it through the garage door.
- Polyaspartic cures much faster, so the floor is often back in use sooner, and it holds its color better in UV. It costs more as a material and has a short working time, which is why careful prep and an experienced installer matter even more.
- Many professional systems combine them: an epoxy or polyaspartic base for build and bond, with a polyaspartic topcoat for UV stability and wear.
What actually decides whether it lasts
- Moisture in the slab. Concrete that is pushing moisture up will lift almost any coating. A simple check: tape a square of clear plastic to the floor for 24 hours. Fogging or a dark patch underneath means moisture is coming through and has to be dealt with first.
- Surface profile. A coating bonds to a roughened, clean surface, which usually means mechanical grinding rather than a light acid wash.
- Oil and old coatings. Oil has to be treated and failed paint or sealer removed, or the new coating sits on top of the problem.
- Cracks and joints. They are filled and repaired before anything goes down, so they do not telegraph through or open back up.
Which one should you pick?
A garage that takes afternoon sun and gets used daily usually does better with a UV-stable topcoat. A shaded garage on a tighter budget, where waiting a few extra days is fine, can do well with a quality epoxy system. If you are not sure, describe the garage and how you use it and we will tell you honestly which fits.
Whatever the product, ask for the prep in writing. It is the line item that separates a floor that wipes clean for years from one that peels at the first hot tire.
Common questions
Which lasts longer, epoxy or polyaspartic?
Why does polyaspartic cost more?
How do you check a slab for moisture before coating?
Related: Garage floor coatings, What a garage floor coating costs in Texas
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