Floor Care · Guide
Two finishes can sit side by side at very different prices per gallon, and the cheaper one can cost you more on the floor. The number that explains it is percent solids. It tells you how much of what is in the bottle actually stays on the floor, and it is the right way to compare finishes.
Floor finish is mostly liquid carrier that evaporates, plus the solid polymer that stays behind as the protective film. Percent solids is that second part: the proportion, by content, that remains on the floor once a coat dries. A 25 percent solids finish leaves about a quarter of its volume on the floor as film; the rest evaporates. The solids are what you are actually buying.
| Solids level | Roughly | Implication |
|---|---|---|
| Lower-solids | about 15 to 18% | Thinner build per coat, more coats needed |
| Standard | about 18 to 22% | Common commercial range |
| High-solids | about 25%+ | More film per coat, builds faster |
These are general ranges; always read the actual product label.
It connects directly to how many coats a floor needs, a high-solids finish can hit the same build in fewer coats than a thin one.
Percent solids is usually listed on the product label or technical data sheet, sometimes as nonvolatile content. Use it together with the coverage rate (square feet per gallon per coat) to understand what a product actually delivers. A higher price per gallon often reflects higher solids, which is not the same as being more expensive to use.
This is the number that matters. Price per gallon is misleading, because a cheap, low-solids finish needs more coats and more gallons to reach the same build. To compare fairly: take the price per gallon, divide by coverage per gallon to get cost per coat per square foot, then multiply by the coats needed to reach a durable build. A high-solids finish that costs more per gallon frequently costs less per finished square foot once you count the coats. That is the comparison to make before switching products.
Related: how many coats of wax, floor finish types, sealing vs. waxing, and cost calculator.
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It is the share of the finish that stays on the floor as dry film after the liquid evaporates. Higher solids means more protective material per coat.
Often, because it builds faster and can be more durable per coat, but the right choice depends on your maintenance method and budget. Compare on cost per finished square foot.
Common commercial finishes run roughly 18 to 22 percent, with high-solids products at about 25 percent and up. Read the label for the exact figure.
Usually yes. More film per coat means you can reach a durable build in fewer coats than with a thin, low-solids product.
On cost per finished square foot: price per gallon divided by coverage, times the number of coats needed for a durable build, not on price per gallon alone.
No. Solids is about how much film stays on the floor; gloss is about how shiny that film is. They are related but distinct properties.
Often higher solids and better polymer chemistry. A higher price per gallon can still be cheaper per finished square foot if it needs fewer coats.
A thicker film per coat can wear longer between services, which is part of why high-solids products are popular for high-traffic floors. Application still matters.
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