Here's an opinion that doesn't win me friends in the procurement world: A supplier who claims they can do everything is usually the last one I want to call.
I manage purchasing for a mid-sized manufacturing facility—about 150 employees, three locations, and eight active vendors. That works out to roughly $120k in annual orders. Actually, closer to $130k if you count every box of gloves and safety glasses. I report to operations and finance, and I'm the one who gets the phone calls.
Last fall—September, I think, though don't quote me on the month—I bought tickets to a Maroon 5 PPG Paints Arena concert. I stood on the sidewalk, looked up at the PPG Paints Arena outside sign, and thought: here's a global coatings company whose name is on the building, and they're not trying to run the venue. They know their lane. That's a kind of discipline I wish more suppliers had.
PPG isn't a tiny specialist, obviously. They make paints, industrial coatings, sealants, adhesives, and specialty chemicals. But they don't pretend to be a one-stop shop for everything a factory can rubber-stamp. They have boundaries. And boundaries are exactly what I look for when I need something real.
The solvent test
If you've ever typed "where can I buy solvent" into a search bar, you know how useless the results are. The question isn't where to buy solvent; it's which solvent, what grade, and with what documentation.
Take acetone. The acetone CAS number is 67-64-1. According to PubChem (pubchem.ncbi.nlm.nih.gov), that's the official CAS Registry Number. If you're ordering for a coatings or cleaning operation, you also need to know whether you're buying technical grade, ACS grade, or something else. You need an SDS. You need the right hazard labels for storage. Every time I order a solvent, the SDS gets filed before the vendor gets paid. If a supplier can't produce it before shipment, I treat that as a red flag. That rule has saved us from more than one bad delivery.
A vendor who answers "where can I buy solvent" with "we carry that" isn't helpful. A vendor who responds "what's the CAS number, and what's the use case?" is worth the extra cost. I know that sounds obvious. It isn't—because "we can get it" is easier to say than "let me check compatibility first."
What a powder coating chart taught me
A few months ago, I requested an aluminium powder coating colour chart for a racking project. Any powder coater knows what that means: RAL colors, gloss levels, substrate prep, and cure temperatures. A generalist doesn't. They sent me a PDF with a rainbow of colors and no application notes. When I asked about pre-treatment, the email went silent for a week.
That generalist didn't ask about the alloy, the environment, or whether the racking would see chemical splash. The right coating for a humid shop floor is not the same as decorative trim. The chart alone can't tell you that.
That's the pattern. When you ask a specialist a detailed question, they answer it. When you ask a generalist, they go quiet or Google it while you're on hold. I don't blame generalists for not knowing everything. I blame them for not telling me what they don't know.
One of my regular suppliers—adhesives, sealants, and specialty chemicals—once told me plainly: "Powder coating isn't our strength. Here are three certified applicators." That quote earned my trust more than any "we can do it all" pitch. Their honesty kept me as a customer for the products they do well, and it started a relationship with an applicator who's been solid ever since.
When "one stop" means "blame triangle"
From the outside, one-stop supply looks efficient. One PO, one invoice, one account manager. Sounds nice. The reality is that "one-stop" often means one coordinator who calls three other companies behind the scenes. You're paying their markup and taking their coordination risk.
I learned this the hard way in 2024. We bought a batch of "matching" solvent from a generalist because the price was 15% lower than our usual specialty supplier. The numbers said it was a good deal. My gut said something was off—the sales rep never asked about the application. I ignored the gut feeling. When the shipment arrived, it had no SDS and the lot number didn't match the invoice. Our ops team spent most of a day backtracking and relabeling. The 15% savings vanished.
When I asked why the SDS wasn't included, the rep said, "We just source it." That was the whole problem in one sentence.
Looking back, I should have asked more questions before the PO. If I could redo it, I'd ask for a spec sheet, an SDS, and a clear statement of what the product was compatible with. But the lesson stuck: the cheapest "yes" is often the most expensive answer.
But don't we want fewer suppliers?
To be fair, there is a version of one-stop shopping that works. A good master distributor who is honest about their network can be extremely useful. For office supplies and standard PPE, we use one. It saves time and nobody has to think about it.
But when the question becomes "where can I buy solvent" or "which coating is right for this substrate," the stakes change. A wrong solvent can clean a part or ruin it. A wrong powder coating can fail before the warranty expires. The cost of a mistake is much bigger than the cost of a PO.
A specialty supplier's "no" is useful information. It tells me where to look next and keeps my vendor list honest. In procurement, that information is worth real money.
My experience is based on roughly 200 purchase orders a year across 15 suppliers. If you're running procurement for a massive chemical plant, maybe you need a different model. I can't speak to that. And I should add: all my suppliers are domestic, so I don't have direct experience with international sourcing. But for mid-sized operations like ours, clarity about what a supplier doesn't do saves more money than a vendor's promise to do everything.
I'll keep buying tickets to events at PPG Paints Arena. I'll keep glancing at the PPG name on the arena outside as a good brand reminder. But what I really value is the same discipline PPG shows: know what you make, make it well, and don't pretend to be something you're not. That's not a limitation. That's what separates a professional from a sales pitch.