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Polyaspartic is not a kind of epoxy. It is an aliphatic polyurea, and its two parts start reacting with each other the moment they meet in the bucket, without waiting on air or moisture to set them going. Left to itself that reaction is far too quick to spread across a floor. The polyaspartic part is the brake: an ester built into the resin that slows the reaction down to something a crew can actually work with. Everything people like about the material, and everything that makes it unforgiving, comes out of that one piece of chemistry.
The first consequence is the working window. Once a batch is mixed it is going off whether or not anybody is spreading it, and the usable stretch of it is counted in minutes, not in hours. A bigger floor therefore wants more people on it, not more days, and the crew is sized before the first bucket is opened. The second consequence runs the other way, and it is why we reach for polyaspartic on a cold slab or a damp coastal morning: it is far less troubled than epoxy by the temperature of the concrete and the moisture in the air above it while it sets.
The third consequence is color. Epoxy carries a ring structure in its backbone that ultraviolet light slowly picks apart, which is why an epoxy top coat ambers under direct sun. Polyaspartic has no such ring to lose, so it keeps its shade outside, and that is why a patio or a pool deck gets a polyaspartic build and not an epoxy one. Indoors, out of the sun, both materials hold their color, and what decides between them is time and money instead. Polyaspartic is one of several concrete coating systems we install, and the fast cure that matters in a working warehouse matters much less on a spare-room floor.
A coated floor is built in layers, and each layer has to be hard enough to carry the next one. With epoxy that means the base coat goes down, the flake goes into it wet, and then the floor sits overnight before anyone can scrape it back and seal it. Polyaspartic reaches that point in a few hours, so the base, the broadcast and the clear seal coat all happen between morning and evening. That is the whole reason a two-car garage in La Cañada Flintridge went from an oil-stained slab to a sealed floor in eight hours, and a Santa Monica bay in six.
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The second wait is longer and it is the one people actually feel. Foot traffic is fine within a few hours of the last coat. A car, a forklift, a rack of stock or a heavy planter is a different load, and the floor has to finish reacting the whole way through before it takes any of them. Epoxy can keep a garage bay out of service for the better part of a week on that count. Running polyaspartic through both coats, rather than only through the clear one on top, is what buys most of that second wait back, and it is the single reason most people pay the difference.
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Epoxy and polyaspartic floors in Los Angeles generally run $5 to $7 per square foot. What moves a quote inside that range is the state of the slab, the number of edges that have to be cut in by hand, and how much of the build runs in polyaspartic instead of epoxy. It is also why we would rather price a floor after standing on it than over the phone. The speed has a price on our side too. A polyaspartic coat cannot be stretched, reopened or gone back over once it has started to set, so a floor has to be planned, staffed and mixed in the right order before anything is poured. On a working warehouse floor in Huntington Beach that meant grinding back to bare concrete and laying two coats of gray polyaspartic inside nine hours.
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