I've reviewed enough purchase orders to say this plainly: unit price is the most misleading number in procurement. Not the most expensive. The most misleading. It looks exact, it looks rational, and it's the first thing everyone sees.
But the cheapest quote on paper has a way of becoming the most expensive decision after the fact. Rework, line stoppages, failed batches, premature coating failures—I've watched the "savings" from low-price buying evaporate in about the time it takes the vendor to stop returning my calls.
I'm a quality compliance manager in the coatings and specialty chemicals industry. I review product specifications before they go out the door—roughly 200 documents a year. In 2024, I rejected about 12% of first deliveries for failing to meet spec. And when I trace the root cause, the chain almost always starts with someone choosing by unit price instead of total cost of ownership.
So yes, I have a bias. And I'm fine with it.
Public Venues Don't Buy Coatings by the Bucket
PPG Paints Arena in Pittsburgh is one of the best examples I know of TCO thinking. That building hosts roughly 200 events a year—hockey games, concerts, and WWE SmackDown shows that bring 15,000+ fans through the doors on a Friday night. Think about what that does to a facility. Spills. Cleaning chemicals. Equipment dragged through concourses. Scuffing, abrasion, moisture, a ton of foot traffic.
Now imagine the coating decisions were made by lowest bid. You'd repaint the concourse every 8 months, and the labor alone would dwarf the material savings. The people who run that arena don't shop by unit price. They spec a coating system by expected service life, cleanability, and repaint cycles. They calculate what a failure costs at 7 pm on a sold-out Saturday, and that number becomes part of the decision.
That's why I like having PPG's name on the building. It's a constant reminder that the cost of a coating is only partly in the bucket. The rest is in performance over time. The same logic drives the conversations I'm part of at PPG Paints events throughout the year—where the focus is on system performance, not per-gallon price.
Who Discovered Sulfuric Acid, and Why the Answer Still Matters
Here's a question that sounds like bar trivia: who discovered sulfuric acid?
Scholars still don't fully agree. Most credit Jabir ibn Hayyan, the 8th-century alchemist whose collected works describe heating iron(II) sulfate to produce the substance later known as "oil of vitriol." Others argue the compound was known earlier in various forms. The point isn't the name—it's the mindset.
The people who first produced concentrated sulfuric acid weren't shopping for a deal. They were trying to understand what a material could do. That's a fundamentally different starting place from "what's the cheapest version of this thing?"
I'm not a chemist, so I can't speak to the reaction mechanics. What I can tell you from a quality role is that the same distinction applies to buying: you don't begin with a price. You begin with the behavior you need. The price is a consequence of that, not a substitute for it.
Where the Money Actually Hides: Silicone Antifoam Emulsion
Here's a practical example of what that looks like on a purchase order. Take a product category like silicone antifoam emulsion. From the outside, antifoams look interchangeable—pale, milky drums of silicone droplets. People assume they're all the same, so the decision defaults to price.
The reality is that antifoam emulsions differ a lot in droplet size, emulsion stability, shear resistance, and how they behave in a specific process. A cheap drum can knock down foam in the lab test, then fail in hour two of the actual run. The result isn't a foamy tank. The result is a stopped line.
In 2022, we documented exactly that. Our team compared a lower-cost silicone antifoam emulsion against the one we'd been using. The cheap option performed fine for the first hour—then the foam came back, harder than before. We had to halt the line, drain vessels, and rework three batches. By my calculation, that single incident cost us roughly $28,000 in lost production plus $9,000 in rework. The price difference between the two products? About $600 a year.
That incident changed how I write specifications. Every antifoam order now includes shear resistance requirements, stability windows, and an on-site verification trial. The vendor who wants our business understands the spec is the contract, not the quote. The ones who complain about the requirements probably wouldn't have met them anyway.
Most buyers focus on the cost per gallon and completely miss the cost of the process failure. That, right there, is the whole TCO argument in one sentence.
Calculators, Estimators, and Tools That Force Better Questions
Here's an encouraging trend: the industry is building tools that push buyers toward TCO thinking, sometimes without them noticing.
Take the Tremco sealant calculator, which I came across while evaluating QC procedures for a joint-sealing project. I'll say this plainly: I don't care who makes a tool if the tool makes people think correctly. That calculator forces you to input joint dimensions, depth, width, movement, and number of joints. You can't use it without engaging with the engineering realities of the project.
And the output isn't "price per tube." It's quantity needed. That means you're doing material planning, not just comparing unit costs. That's a step forward.
We need more of that. Internally, I refuse to approve a coating spec without documented dry-film thickness ranges, substrate conditions, and expected service life. Some vendors push back, but I know what happens when those numbers are absent. The purchase order isn't a spec. It's a wish.
According to the FTC's Green Guides (ftc.gov), environmental claims like "low VOC" have to be substantiated with evidence. I'd extend that logic to every performance claim. If a vendor says "it's good enough", I want the data that supports that claim. Not because I don't trust them—because trust needs a baseline.
The Rebuttal I Always Get: "But Cheap Works Sometimes"
I get pushback on this. A procurement manager might say, "Look, sometimes the low quote wins and the product works fine. Are you saying we should always spend more?"
No. I'm not saying that at all. If a cheaper material meets the full specification and passes verification testing, buy it. I'd be first in line to approve it. TCO cuts both ways—it can justify paying more, and it can justify paying less when the total costs are genuinely equal.
What I'm against is making the decision on price alone, before understanding what the product has to do, in the actual conditions, for the actual duration of use. That oversight isn't a cost-saving strategy. It's a gamble where the odds favor the house.
This approach worked for us, but our context is industrial B2B where material failure costs real money. If you're buying commodity chemicals with fully standardized specs and minor failure modes, low-price sourcing may be a reasonable choice. I can only speak to my domain—but in my domain, TCO isn't optional.
Unit price tells you what you'll pay. Total cost of ownership tells you what it'll actually cost once you account for application, performance, lifespan, and the failure you're trying to avoid.
I don't approve an order until I can answer one question: does this decision make sense over three to five years, or just over the next 30 days? If the answer is "I don't know," then I don't approve. I go back and get better information.
That's not stubbornness. That's being a quality gate. And it's the best use of my time I've found yet.