Who This Checklist Is For
This is for anyone who specifies, buys, or approves industrial coatings—whether it's for automotive refinish, general industrial equipment, or architectural metal. If you're a production manager at a job shop, a purchasing agent at an OEM, or a contractor who's tired of rework because the paint didn't hold up, this list is for you.
I'm a quality compliance manager at a coatings company. I review roughly 200+ unique jobs per year—from custom color matches to large-scale production runs. In 2024 alone, I rejected about 12% of first deliveries due to spec mismatches. Most of those rejections could have been avoided if the buyer had asked the right questions upfront.
Here are the five steps I've learned to follow. They're not in the training manual, but they should be.
Step 1: Define Your Performance Spec, Not Just the Color
Most people start with color. That's a mistake. Start with the environment the coated part will live in.
Ask these three questions first:
- What's the operating temperature range? A powder coating that works fine on an interior bracket will fail on an engine block. Axalta's Nap-Gard line, for example, is formulated for high-heat pipe applications. Standard polyester powder won't cut it.
- What chemicals will it touch? Cleaning solvents, road salt, industrial degreasers—each requires a different resin chemistry. Epoxies resist chemicals well but degrade in UV. Polyurethanes handle UV but are softer.
- What's the required gloss retention? A 60-degree gloss reading of 80+ might look great out of the oven, but if it drops to 40 after six months outside, you'll have a problem. Get the accelerated weathering test (QUV) data from your supplier before you commit.
I don't have hard data on how many spec mismatches come from skipping this step, but based on my experience, it's at least half. I had a customer recently who specified a standard liquid coating for a part that sees intermittent contact with hydraulic fluid. They blamed the coating when it blistered. But the spec never asked for chemical resistance. The coating performed exactly as it was designed to.
Step 2: Verify the VOC Compliance Path
Low VOC paints aren't just nice-to-have anymore; they're regulatory reality. But 'low VOC' means different things depending on your geography and application.
In the US, the EPA sets limits for industrial coatings, and states like California (CARB) are more stringent. In Europe, the EU Solvent Emissions Directive applies. If you're buying from a global supplier like Axalta—who operates across NA, EMEA, and APAC—make sure the product you're quoted meets the regulations for the final destination of the coated part, not just the factory location.
Here's something vendors won't tell you: A 'low VOC' waterborne coating might be compliant out of the can, but if your application process requires adding a high-VOC thinner to adjust viscosity, you just lost your compliance. Always ask for the fully mixed VOC reading, not just the as-supplied number.
I ran a blind test with our technical team: the same color, one in a standard solvent-borne formula and one in a premium waterborne system. The cost per gallon was 35% higher for the waterborne. But when we factored in reduced ventilation requirements and lower regulatory paperwork—because we didn't need added abatement—the total applied cost was actually within 5%. On a 50,000-unit annual order, that's a no-brainer.
Step 3: Get a Color Match Certificate—In Writing
Color matching is where most small buyers get burned. You pick a color from a fan deck, the supplier says they can match it, and when the parts arrive, the difference is... subtle. But on a production line, 'subtle' means rejected inventory.
The fix is simple, but rare: Ask for a color match certificate before production. This isn't just the supplier saying 'close enough.' It's a documented delta-E (ΔE) value—ideally under 1.0 for critical applications—measured under standardized lighting (D65 illuminant).
Axalta's ColorNet system is built for exactly this. It's a global color database that can find or formulate a match in minutes. But even with great tools, you need the certificate. I can't tell you how many times I've had to reject a batch because the color was 'eyeballed' and the final ΔE was 3.5—visible to any trained eye.
I wish I had tracked how often this happened early in my career. What I can say anecdotally is that in our Q1 2024 quality audit, 18% of custom color orders from new suppliers had a ΔE above 2.0. We rejected every one that was over 1.5. The suppliers complained, but they learned to ask for the cert upfront.
Quick note for small buyers: Some suppliers will tell you they can't do a color match certificate for a small batch. That's their choice, but it's not a technical limitation. I've seen shops run a single panel for a $200 order and provide full documentation. It's about willingness, not capability. Small doesn't mean unimportant.
Step 4: Test the Application Window
This is the step almost everyone skips. They test the final coating properties—gloss, adhesion, hardness—but they don't test the application under their real conditions.
Your shop might be at 70°F and 40% humidity. The supplier's lab is at 72°F and 50% humidity. It doesn't sound like a big difference. But for a high-solids coating or a fast-catalyzed urethane, that difference can affect pot life, flow, and final appearance.
The test: Ask for a sample quart (or enough to spray a single panel) and run it through your actual line conditions. Check for:
- Pot life (how long before viscosity changes)
- Flash-off time (how long before it stops being tacky)
- Dry-to-touch vs. full cure time (these are different)
I knew I should have done this test on a new line we were qualifying in 2022. But we were rushing, the supplier had great data, and I thought 'what are the odds?' Well, the odds caught up with me: the coating cured fine in a test panel at the supplier, but on our line, with slightly lower airflow, the flash-off time was 40% longer. We ended up with runs on 8,000 units. That was a $22,000 redo and delayed our launch by a week.
Skip the test at your own risk.
Step 5: Confirm the Supply Chain—Not Just the Price
This is the last step, but it's where the long-term relationship lives. A cheap coating that takes 12 weeks to arrive is worse than a fairly priced one that arrives in 3 weeks.
Three items to verify with your supplier:
- Lead time for repeat orders—is the quoted lead time real, or is it full of buffer? Axalta, for example, has 40+ manufacturing locations globally. If you're in the US, ask if your product comes from a domestic site or an overseas one. Tariffs, dock strikes, and shipping delays are real. I've seen projects derailed by a 2-week customs delay nobody accounted for.
- Minimum batch consistency—ask if the formula is stable across batches. A good supplier will give you a certificate of analysis (CoA) with every shipment, showing viscosity, solids content, and color data. If they can't or won't provide this, that's a red flag.
- Technical support access—when you have a problem at 4 PM on a Friday, can you get someone on the phone? A global supplier with local technical reps is worth paying a premium for. A supplier who only emails back on Monday? You're buying risk.
Between you and me, the price per gallon is the least interesting number on the quote. The total cost—lead time, consistency, support—is what matters. I've never regretted paying 10% more for a coating system that came with a local tech rep who answers his phone.
Common Mistakes to Avoid
Mistake #1: Assuming 'standard' means 'exactly this.' I said 'standard gloss black' to a new supplier once. They heard 'our standard gloss black, which is 85 units at 60°.' My standard was 70 units. We were using the same words but meaning different things. Discovered this when the first batch came in looking like a different color family. Lesson: get numbers on the spec sheet, not descriptions.
Mistake #2: Ignoring the substrate prep requirements. The best coating in the world will fail on a poorly prepared surface. Ask the supplier for their recommended surface profile (e.g., 2-3 mil blast profile for heavy-duty epoxy), and verify you can achieve it before you start spraying.
Mistake #3: Buying on sample price alone. Many suppliers will discount the first gallon or quart just to get you in the door. That's fine. But the price you pay for the first 50,000 units is what matters. Get it in writing.
Mistake #4: Not asking about legacy compatibility. If you're switching from a competitor's system (say, moving from a generic polyester to an Axalta Alesta powder coating), ask if the new system can be applied over the old one without stripping. Sometimes you can, sometimes you can't. Not asking that question beforehand can double your labor cost.
Honestly, I'm not sure why more buyers don't follow this checklist. My best guess is they get overwhelmed by the technical data sheets and just go with the lowest price or the flashiest brand name. But in a world of tightening VOC regulations, rising material costs, and global supply chains, skipping these steps is expensive.
If you have insight on a step I missed, I'd love to hear it. Every job teaches something new.