When I took over purchasing for our company in 2020, I thought I had it figured out. My main job was keeping the operations team happy while not getting yelled at by finance. It seemed pretty straightforward: find the lowest price for what the project manager asked for, place the order, and move on.
That approach worked great for paper clips and breakroom coffee. But in 2022, it nearly cost us a $30,000 roofing job.
The Morning That Changed Everything
It was a Tuesday in late September. Our facilities manager, Dave, came to my desk with a requisition for a roofing project. He needed urethane sealant and primer for a re-roofing job on one of our warehouse buildings. I remember him saying, "Just get the standard stuff, you know, the usual."
I said, "Sure," and went to my list of approved vendors. I found a sealant at a decent price and a primer that was, no joke, 40% cheaper than the Tremco option Dave had vaguely mentioned. I thought I was being a good admin buyer—saving the company money on materials.
I was wrong. Honestly, I was being penny-wise and pound-foolish. The order went through. The primer arrived. The crew started work.
The Moment of Realization
Three days into the job, Dave walked into my office. He didn't look happy. "The primer isn't curing," he said. "It's been 48 hours, and it's still tacky. The sealant won't bond to it. We've had to stop."
I sat there, confused. "But it's primer," I said. "Primer is primer, right?"
Dave just shook his head. "Did you check the data sheet?"
The truth is, I hadn't. I'd looked at the price and the size of the bucket. I hadn't even thought to request the Tremco 171 primer data sheet or compare the technical specs. I'd assumed that all primers designed for urethane sealants would perform the same way. (Should mention: I didn't even know what a primer data sheet was back then.)
What I Learned About Primers (The Hard Way)
The cheap primer we bought wasn't designed for vertical lap joints on a metal roof. It was a general-purpose product. The Tremco 171 primer, I later found out from its actual data sheet, is specifically formulated for:
- Providing a non-tacky surface for sealant application within specific time windows
- Adhesion to a wide range of substrates—including aged metal, concrete, and wood
- Compatibility with high-movement urethane sealants used in expansion joints and flashing
The cheap stuff? It was meant for indoor use on concrete floors. We were using it on a vertical roof surface in the fall. The temperature and humidity were within range for the project, but not for that specific primer.
People think expensive vendors charge more just because. Actually, vendors who invest in R&D and testing can charge more because their product reduces risk. The causation runs the other way.
The Real Cost of Saving Money
Let me break down the math on that decision:
- Price of cheap primer: $25 per gallon (saved about $75 vs. Tremco for the whole job)
- Cost of crew downtime: 2 days x $2,500/day labor = $5,000
- Cost of removing and reapplying the failed primer: $3,000
- Cost of re-ordering the correct Tremco 171 primer (with expedited shipping): $180
That $75 "savings" cost us over $8,000. And that's not counting the indirect costs—Dave's lost time, the delayed completion, and the fact that I had to explain to my VP why a simple materials order turned into a project delay.
So the bottom line: That $3 per gallon I saved on the cheap primer ended up costing the company about $8,000.
How I Changed My Process
After that disaster, I completely changed how I handle material orders for specialized work. Here's my new routine:
- Ask for the spec. When a project manager requests a material, I ask them for the product name and, if possible, the product data sheet (PDS).
- Read the PDS. I'm not a chemist, but I can read the "Substrates" and "Application Conditions" sections. If the primer says "Concrete floors only" and we're working on a metal roof, I know something is wrong. The Tremco 171 primer data sheet clearly lists "non-porous substrates like metal" as suitable.
- Get a sub approval. If I find a cheaper alternative, I don't just order it. I email the PM. "Hey, this product is 40% cheaper. But the PDS says it's for X, not for Y. Do you approve?" This puts the liability back on the expert.
- Verify the vendor. I also learned to verify that the vendor can provide proper documentation. The cheap primer company had a photocopied instruction sheet—not a proper technical data sheet. I should have seen that as a red flag.
That unreliable supplier made me look bad to my VP when materials failed. I have a list of approved suppliers now, and I only work with those who can provide a proper Tremco 171 primer data sheet or equivalent documentation.
Final Thought: Data Sheets Are Your Friend
I know looking at a technical data sheet sounds boring. But from my experience managing these orders for 5 years, the 15 minutes it takes to read the specs can save you weeks of headaches and thousands of dollars.
Now, when Dave asks for a sealant or a primer, I don't just grab the cheapest option. I pull up the data sheet, check the specs, and if it's a Tremco product, I know the documentation will be solid. The Tremco 171 primer data sheet lists every property you'd want to verify: VOC content, cure time, application temperature range, and substrate compatibility.
It's not just about being a good buyer. It's about being a responsible one. And honestly, my relationship with Dave is a lot better now.
