I'm the office administrator for a 260-person custom fabrication shop—metal and plastic fabrication, assembly, and a building that constantly needs something fixed. I manage purchasing for maintenance materials, shop consumables, office supplies, and vendor contracts. Roughly $180,000 a year goes through my desk across 25 suppliers. I report to operations for what I buy and to finance for what I spend.
I'm not a chemist. But a $2,847 mistake taught me more about silicone than I ever wanted to know.
We saved $84. It cost us $2,847.
In early 2023, maintenance asked me to order sealant for the exterior joints around our loading dock and office windows. A new vendor quoted me an unbeatable price on “silicone sealant.” The listing said it was waterproof, flexible, and excellent for indoor and outdoor use. Our regular supplier charged $12 per tube. This vendor charged $5. I ordered a case of 12 and saved $84. Felt good.
Seven months later, the crew was scraping it off.
Actually, they scraped off what was left. The material had shrunk, cracked, and peeled away from the metal frames. When I finally tracked down the technical data sheet, I understood why: it wasn't a 100% silicone product. It was an acrylic-based sealant with some silicone added—what people in the industry call siliconized latex. The online listing said silicone. The data sheet said something else.
The rework was the real invoice. Two maintenance techs spent roughly 32 hours scraping, cleaning, and resealing those joints. At our fully loaded labor rate—wages, benefits, overhead—that's about $2,400. Then add the wasted case of material, the replacement product, and an expedited freight charge because we couldn't leave the dock unsealed for another week. The final number landed at $2,847.
We saved $84.
The maintenance supervisor still calls that order “the $84 silicone.” He doesn't mean it as a compliment.
“Silicone” is a family, not a formula
The thing I didn't know when I placed that order is that silicone is a broad category. Saying you bought silicone is like saying you bought metal. A $2 paper clip is metal. A $200 stainless steel flange is metal. They are not the same material.
What most people don't realize is that silicone products differ by cure chemistry, filler content, additives, temperature rating, flexibility, and whether they're suitable for food contact, electrical use, or exterior weather exposure. The same silicone family shows up in a food-contact silicone bib, bakeware, electrical insulation, medical tubing, and the sealant around a loading dock door. The word silicone doesn't tell you which one you're holding.
Federal advertising guidelines say claims need to be truthful and substantiated (ftc.gov). But a seller can truthfully say waterproof without telling you how long it will stay flexible on a metal frame that bakes in the sun and freezes in January. The details live in the data sheet, not in the headline.
For outdoor sealing and general maintenance, I've standardized our stock on Dow Corning 732 RTV Silicone SE. The newer packaging in many markets says DOWSIL 732, but distributors still list it under the old Dow Corning name. It's a true one-component RTV silicone. It cures with moisture and releases acetic acid as it does—that's the vinegar smell you notice when you open a tube. The manufacturer publishes the service-temperature range, movement data, and adhesion information. Just as important, the limitations are documented too. No product is right for every surface, and a proper spec sheet tells you where a product doesn't belong.
To be fair, 100% silicone isn't always the answer. Acid-cure silicones can be wrong for sensitive plastics, and some jobs need neutral-cure chemistry or something else entirely. The point is not that Dow Corning 732 is a magic product. The point is that when I order it, I know what I'm getting. That's what buying a specification gives you.
The same pattern shows up in other materials. We buy polyethylene compounds regularly for cutting boards, wear strips, and machine guards. Polyethylene is a workhorse: chemical-resistant, low-friction, easy to fabricate. But no one should buy a compound by comparing prices alone because the grade determines the performance. Same family, different product.
Or take the frequent question, what's the best foam board adhesive? The first question isn't a brand. It's what kind of foam board, on what substrate, under what conditions. Some solvent-based adhesives can melt EPS foam on contact, while others are formulated for foam and won't damage it. Best is meaningless until the material and service conditions are defined.
The real cost is in the labor, not the tube
A maintenance tech at our shop costs roughly $75 an hour, fully loaded. A quality tube of silicone sealant costs maybe $10 to $12. The cheap stuff costs $5. The entire material difference is a handful of dollars—and if a cheap product costs just one extra hour of labor, you've lost about $70. We optimized the $7 difference and ignored the $75-an-hour risk.
In our 2024 vendor consolidation project, I pulled two years of maintenance records. Fourteen exterior sealant jobs had been redone within 18 months of the first application. All of them used discount or unfamiliar products. The material cost difference between those purchases and what we would stock now was about $63. The labor to redo those jobs was roughly $3,400. The numbers never appeared on the same report, so nobody added them up. I keep a grudge list.
Rework also pushes other work aside. When two techs spend a full day on a job that should have lasted years, the preventive maintenance that was scheduled for that day shifts. The delay has its own cost, even if it never lands on the original work order.
Here's something vendors won't tell you in the first conversation: the lowest quote buys the product. It doesn't buy application support, documentation, or accountability for failure. If a material fails, nobody refunds your labor. I now ask about the cost of failure before I ask about the price of the tube.
What I changed
I buy differently now. Before ordering any maintenance material, I ask four questions:
- What exactly is in this product, and what does the data sheet say?
- Where is this product not appropriate?
- What does the price include—and what does it not include?
- If the product fails, who pays for the labor?
I've also changed how I evaluate vendors. A supplier who says “here's what this product won't do” earns more trust than one who says “this product does everything.” If a distributor can't send a full SDS in one email, I'll pay more to work with someone who can. The same logic applies to pricing. It may sound odd, but I compare material suppliers to the USPS rate page: postal prices are public, clear, and predictable. As of January 2025, a First-Class letter costs $0.73 (usps.com). If a federal agency can publish that kind of straightforward pricing, a chemical distributor can state its specs and fees with the same clarity. The ones that don't get the most careful reading.
Our maintenance shelves now carry Dow Corning 732 RTV Silicone SE for general-purpose exterior sealing, a neutral-cure silicone for jobs where acid cure could be a problem, and silicone grease from Dow Corning for O-rings and valve seals. They're not the only products we use. They're just the ones that answer questions before I ask them.
I still buy cheap caulk for indoor cosmetic jobs. There's a time and place for it. But when a material is supposed to keep weather out of a building or keep a machine running, I buy the spec and budget the labor. And I trust suppliers who are transparent about both.
That approach doesn't make me a chemist. It makes me the person who doesn't have to explain a second work order for the same job to my VP. That's worth more than the $84 we saved.
Prices and product details reflect what we saw in early 2025; verify current rates and specifications with your supplier.