Polyurea base coats
What is a polyurea floor coating?
Polyurea is a flexible resin used as the base coat in most floor systems, because it soaks into prepared concrete and moves with the slab.
The short version
- Polyurea is a family of resins. It is not a brand and it is not a finish you look at.
- It is normally the base coat, the layer whose job is holding on to the concrete.
- It stays flexible after it sets, so it moves with the slab instead of against it.
- It sets fast, so it goes down in sections, by people who install it every week.
- The topcoat over it is usually a different resin, picked for sunlight and wear.
What polyurea is
Polyurea is a family of resins rather than a product name. Two parts get combined, they react, and what is left is a solid film. What separates it from the older chemistries is speed and flex. It sets quickly, and it stays a little elastic afterward instead of hardening into something brittle.
That combination is why it went into floors. A slab in the southwest Twin Cities metro expands and contracts through the year, and the film on it has to go along. A resin that stretches and comes back does that. A rigid one takes the stress at whatever line is weakest, which is usually a crack or a control joint.
Why it goes down first
The base coat has one job, and that is holding on to the concrete. It gets rolled onto a freshly ground slab and soaks into the profile the grinder opened up, so the grip is mechanical as well as chemical. Everything above it is only as good as that grip is.
Flake gets broadcast into the base while it is still wet, so the chip ends up standing in the coating rather than sitting on top of it. Once the base has set, the floor gets scraped and vacuumed to knock the loose chip off, and then the topcoat goes over the whole thing.
The topcoat is usually a different resin, most often a polyaspartic, because the top layer is the one that sees sunlight, shoe grit and tire heat. Asking whether a floor is polyurea or polyaspartic usually misses that it is normally both, in that order.
The system is the thing
No single layer is the floor. A polyurea rolled over concrete that was never ground has nothing to key into, and no resin makes up for that. Prep, base, flake and topcoat are one thing, and a weak step anywhere in the order shows up later as the same failure.
So the useful question for somebody quoting a floor is not which resin is in the bucket. It is what happens to the concrete first, what goes down coat by coat, and what the top layer is. A quote that answers those three describes a floor. A quote that names a chemistry describes a bucket.
Clear View Surface Solutions installs a polyurea basecoat, decorative flake in a color blend you pick, and a polyaspartic UV-stable topcoat over diamond-ground concrete, so the layers are written down before anybody comes out to look.