Polyaspartic vs polyurea: how the terms actually relate

The distinction that does matter

Aliphatic versus aromatic is the useful axis. Aliphatic chemistries resist ultraviolet degradation and hold their colour in sunlight. Aromatic chemistries, including standard epoxy, amber and chalk under sustained light.

Polyaspartics are aliphatic. That single property is why they are used as the exposed top layer, and why an epoxy left exposed on a sun-lit floor yellows.

What about an epoxy base under a polyaspartic topcoat?

Some marketing argues that any epoxy in the build is a weak link, and that an all-polyaspartic floor is therefore the better product. That is stated more confidently than the chemistry supports. Epoxy, polyurea, polyaspartic and hybrid builds all have legitimate uses, and manufacturers publish UV-stable polyaspartics specifically as topcoats over epoxy and polyurea base coats.

The build we use most often is a diamond-ground slab, a Citadel SLE-100 epoxy base coat, flake broadcast to refusal, and a Polyaspartic F61 clear topcoat. The epoxy does the bonding and carries the body of the system; the aliphatic polyaspartic is on top because that is the layer sunlight reaches. Each material sits where its properties are useful.

None of that makes an all-polyaspartic floor wrong, and we are not going to claim it does. What it makes wrong is judging a floor by one word on a quote. A single-coat polyaspartic over a badly prepared slab will fail sooner than a well-built epoxy-and-polyaspartic system, and the reverse is equally true. The system and the preparation decide the outcome, not the label on one layer.

Why preparation decides more than the product name

A coating can only be as good as its grip on the concrete. A new slab carries laitance, the weak powdery layer finishing leaves at the surface, and a troweled floor is closed enough that liquid sits on it rather than keying into it. Grinding removes that layer and opens a profile for the coating to lock into.

This is the step easiest to skip and hardest for a homeowner to inspect once the floor is down, which is exactly why it is worth asking about beforehand. We prepare every slab mechanically and do not acid etch.

Seven questions to ask any garage floor contractor

These work on us as well as on anyone else quoting your floor. Someone who answers all seven without hedging is telling you how they actually work. Someone who answers in category names is telling you something too.

1. What coating is actually touching my concrete? The bonding layer matters more than the one you can see, and "polyurea system" does not answer the question.

2. How will you prepare the slab? Listen for a mechanical method. Preparation is where most of the real difference between two quotes sits.

3. Are you grinding the whole floor, including edges and corners? Partial preparation is a common shortcut, and the untouched edge is usually where a coating lifts first.

4. What profile are you opening the concrete to? The concrete surface profile is the specification describing how aggressively a slab was ground. A contractor who works to one can tell you which.

5. What is the base coat, by product name, and may I see its data sheet? A named product can be looked up. A category cannot.

6. Is the exposed top layer aliphatic? That single property is what holds colour in sunlight, and it is worth confirming if any part of the floor sees daylight.

7. What does the warranty cover, the product or the workmanship? Those are different guarantees from different parties, and most coating failures are installation failures rather than product defects.

What to ask instead of comparing category names

Ask which specific product is going on your floor, and ask for its current technical data sheet. That document contains the actual properties, the actual cure schedule and the actual recommended use.

We do not republish those figures here, because they belong to the product and they change between formulations. We will hand you the sheet for the system we are proposing.

The coating system is only part of the decision

Two contractors can quote the same resin and deliver very different floors. By the time you are comparing product names you have usually settled the smallest variable in the job, so it is worth stepping back to the ones that are still open: concrete preparation, the installation process, insurance, workers’ compensation, the written warranty, and whether there is a company left to call if something goes wrong.

Those six are also the reason a warranty means anything. A guarantee is only as good as the preparation underneath it and the business standing behind it, which is why we publish what ours covers and what it excludes rather than describing it as a selling point. Qualifying residential garage installations include a Limited Lifetime workmanship warranty against covered installation-related failures, subject to the written terms and exclusions; exterior and commercial work carries its own written terms.