What moves the price on a resinous floor

Measured: what is already on the concrete

Hold the floor fixed — twenty by twenty-two feet, one obstruction, a 25.0-mil solid-colour build — and change only what is sitting on the slab now. The system still derives the same film thickness, because the finish has not changed; what changes is how many passes it takes to reach the profile that thickness needs, and preparation hours scale with that pass count.

Going from bare concrete to a slab that already carries a coating moves the preparation hours from 3.4 to 10.2 on this exact floor — a factor of 3.0 — and nothing about the finished floor has changed at all. The installed cost page turns these hours into a share of the bill once your own rental and labour rates are entered; how large that share is depends on those rates and on the slab.

On a slab that is not bare concrete, ask how many passes the quote allows for. The guide to reading a quote turns that observation into a specific question to ask.

Measured: the finish system, through material rather than labels

"Flake" and "metallic" are not prices, they are material quantities wearing a marketing name. Hold the floor and the traffic fixed again — the same twenty-by-twenty-two garage, a domestic car, automotive chemical exposure, light slip aggregate, a porous substrate taking a penetrating primer, a 100-percent-solids product in 3-gallon kits — and change only the finish.

A quartz double-broadcast on this floor orders 9 kits against 3 for a solid colour on the identical slab — material has scaled with the system before a single hour of labour is counted. Metallic orders 10.85 gallons here, more than flake's 9.69 and far less than quartz's 25.00; what sets metallic apart is the pour coat itself, which the finish systems comparison breaks down layer by layer.

Explained, not measured: how long the room is unusable

A professional crew does not make resin cure faster. What a second or third pair of hands changes is how many of the elapsed hours one person has to personally spend on the slab; the elapsed clock itself runs at the same speed regardless of who is holding the roller.

That clock is temperature-driven, and the cure schedule page derives it from a data sheet's stated windows and the slab's actual surface temperature, using this site's own rule of thumb — an assumption, listed on the methodology page — that cure time roughly doubles with each 18 degrees Fahrenheit the slab runs colder than the sheet's reference temperature. A garage floor coated in March can take noticeably longer to reach vehicle traffic than the same product applied in July, and that delay is a genuine cost even though no invoice line names it. No dollar figure is attached here because none of this site's sources price a day of lost garage use.

Explained, not measured: controlled versus uncontrolled dust and VOC-compliant product

Preparation that generates airborne silica is regulated rather than left to judgement. For a walk-behind floor grinder, the federal construction silica standard's Table 1 specifies either a machine with integrated water delivery, or a dust collector with a filter of 99 percent or greater efficiency and a filter-cleaning mechanism plus HEPA vacuuming between passes indoors. Shot blasting has no row in that table, so an employer using a blaster has to assess exposure — by air monitoring or objective data — against the airborne limit instead. The dust control page reads the rows that do apply.

On the material side, the federal architectural-coatings table sets 400 g/L for floor coatings and 450 g/L (50 g/L looser) for industrial maintenance coatings — a harsher-duty category whose products must say so on the label. Residential flooring is named in the tighter row's own definition, so a home floor is likely to fall there instead. The permits guide spells out the exact category wording; check the product label against whichever row applies, and against any state or air-district limit stricter than either federal ceiling.

How the two measured drivers compare

The two measured drivers move different things: what is on the slab moves machine hours, the finish system moves material. This site has no honest way to turn either into dollars for your area, so it does not rank them against each other, and it does not rank either of them against the two explained drivers above, which no calculator on this site runs.

Preparation hours above rest on this site's own productivity allowances — 180 square feet per machine-hour for grinding, 45 square feet per hour for hand edging, a 4-inch hand-prepared edge band, and the calculator's own allowances for clean-down between passes and for the edge around each obstruction — and the gallon and kit figures include this site's own material-loss allowances. The film thickness for each finish and the flake and quartz pounds are also this site's own planning figures — the film-thickness bands and the broadcast rates — which the methodology page lists as assumptions; a manufacturer's build sheet replaces all three. None of those is a manufacturer rating; the methodology page lists each one as an assumption, with how to replace it with your own number.