A Coating Selection Checklist: Chemours Teflon Coating, Epoxy, and Lessons I Paid For

I'll start with the part most coating articles skip: I'm the guy who gets called after someone buys a drum of expensive coating and applies it to a part that wasn't ready. I've handled industrial coating orders for eight years, and I've personally made and documented 14 significant application mistakes—roughly $86,000 in wasted budget. This checklist is the result. It's not the whole story, but if you follow it, you'll avoid the dumb stuff.

This is for maintenance teams, fabricators, and engineers who need a coated part to survive a specific environment. It also applies if you're a two-person shop doing epoxy coatings Austin Texas for a local manufacturer. Small orders deserve the same process; I've had some of my best technical conversations on $300 jobs.

When to Use This Checklist

Use this when someone hands you a part and says, "coat it so it doesn't corrode" or "we need a non-stick surface." If the part isn't defined yet, spend another 30 minutes defining it first. This list assumes you have a specific part and a working environment.

There are eight steps. They look obvious. Some are not.

Step 1: Define What the Coating Has to Survive

Write down the actual exposure: chemical, heat, abrasion, UV, water, or vacuum. Don't write "harsh environment"—that tells me nothing. I said "as soon as possible" to a vendor once, he heard "whenever convenient," and a powder-coated batch sat on his shelf for two weeks. That's cheap. The expensive version is ordering "chemical-resistant" coating for a line that, it turns out, uses concentrated HCl at 60°C (140°F).

If you're unsure what's in the process stream, walk the line with a flashlight. Most chemical resistance charts assume clean, controlled immersion. Real-world service often has splatter, condensation, and temperature swings.

Step 2: Check the Substrate and the Part Sequence

Aluminum, steel, plastic, and concrete all demand different pretreatments. If the part is made of a solvent-sensitive plastic, that changes things. And if your assembly includes solvent bonded products (like an acrylic manifold that's chemically welded), do the bonding before coating, then mask off the joint if it has to do any structural work. I learned this after a customer solvent-bonded a clear sight glass, we coated around it, and the solvent gas bubbled through the coating. (That cost $1,200 plus a very awkward phone call.)

Mechanical issues are also part of orientation: sharp edges get thin coating, corners are the first place to fail. Make a note of them now.

Step 3: Choose Chemistry by Exposure, Not Brand Hype

Here's where brand names actually matter—but not the way most people think. The Chemours chemical company is one of the few places that makes the raw fluoropolymer resin behind what is commonly sold as "Teflon coating." If you need release, high temperature, or extreme chemical resistance, a Chemours Teflon coating (PTFE, PFA, FEP, ETFE—they're not all the same) can be the right call. But "Teflon" is a brand, not a coating type. A Teflon coating on a poorly prepared aluminum part will fail faster than a cheap epoxy on a well-prepared one.

Epoxy coatings are the workhorses for abrasion and moderate chemical resistance. I walked a maintenance manager through epoxy coatings Austin Texas for a small sewer lift station, and the same rule applied: the formulation is only as good as the surface prep. If you're choosing between epoxy and fluoropolymer, ask two questions: (1) what is the maximum service temperature, and (2) what chemicals will it see in normal operation? Don't pick solely because someone says "Teflon is the magic fix" or "epoxy works everywhere."

One of my biggest regrets is recommending a generic "food-safe" coating for a mold without checking whether the customer needed FDA or NSF data. The coating probably worked. The paperwork didn't. The Chemours team and authorized applicators will tell you, but you have to ask.

Step 4: Verify Cure and Bake Requirements Before You Buy

This is the step most people ignore, including me in 2019. I approved a large order of fluoropolymer-coated rollers, and the shop baked them at the standard schedule without checking that the roller bearings were temperature-rated. Six figures of work later, we had grease running out of $3,400 bearings. The coating was fine. The assembly wasn't.

Every coating listed in the SDS or technical data sheet has a cure requirement. Ask for it in writing. If your part can't handle the bake temperature, you either need a different polymer (PFA vs. PTFE is not just a science project—it's about melting point and film continuity) or a low-temperature cure system.

Step 5: Require an SDS and a Written Specification

I still kick myself for not documenting verbal promises. Get a safety data sheet, a technical data sheet, and a written coating spec. This matters for two reasons: safety and repeatability. The OSHA HazCom standard means your supplier should furnish an SDS easily. If they hesitate, walk away.

While you're reading the SDS, take a minute to answer the "what products contain hydrochloric acid" question that keeps showing up in maintenance shops because someone sees a coating with poor HCl resistance and assumes all acids are the same. HCl shows up in toilet bowl cleaners, masonry cleaners, pool chemicals, and some industrial metal treatment baths. If your process uses any of these, don't just say "acid-resistant epoxy." Say "this specific formulation, at this concentration, at this temperature." Write it down.

Step 6: Test on a Coupon, Then Test Again

If the order is worth more than $500, run a sample coupon through the same prep, coating, and cure cycle. Then simulate one thermal cycle, or one chemical immersion, before you coat the expensive parts. I once ordered 250 coated sleeves with "standard dimension" stamped on the drawing. We both said "standard size" but meant different things. The coupons were fine; the full run was a half-inch oversized and nothing fit the existing assembly.

Coupons don't catch every process variation, but they catch most. Use a real part if possible, even if it means sacrificing one. Cheaper than redoing fifty.

Step 7: Don't Forget Edges, Threads, and Markings

Edges get less film thickness. Threads collect coating and then don't fit. Markings get covered. I ruined a $3,200 order of PTFE-coated bolts because I didn't tell the applicator to mask the threads. The coating made them chemically resistant and also completely unusable. We had to strip and recoat every one.

Put a masking list in the PO. It sounds overkill, but it's the difference between "they should have known" and "we told you to mask."

Step 8: Keep a Sample of the Coating System and the Test Data

Keep a cured coupon in a labeled bag. Store it with the date, batch number, coating supplier, cure schedule, and film thickness. When a part fails in 18 months, you'll be glad you have a reference. I created our pre-check list in Q1 2024 after a failure investigation turned into a "who did what" debate that took two weeks. We've caught 47 potential errors using this list in the past 18 months. Most were paperwork gaps, not coatings.

Common Mistakes I Still See in Coating Specs

"We'll just use Teflon" without specifying which fluoropolymer. PTFE, PFA, FEP, and ETFE are different animals. PTFE has excellent release and temperature resistance; PFA is melt-processable and forms pinhole-free films; ETFE adds toughness. Pick the one that matches your process.

Ignoring cure temperature for assembled parts. Already explained. This is the most expensive oversight I know.

Calling something "green" or "safe" without proof. If you market a coated product as biodegradable or environmentally friendly, the FTC Green Guides require substantiation. A vague recycling label without evidence is a compliance risk. (You can check ftc.gov/green-guides.) It's also just poor engineering.

Assuming a multiple-use "standard" coating can handle a chemical it wasn't tested against. Chemical resistance is not a yes/no checkbox. It's concentration, temperature, exposure time, and residual stress. If you don't have test data, assume nothing.

Final Note

I don't think you should buy the cheapest coating or the most expensive one. You should buy the one with a technical data sheet, a documented cure schedule, and an applicator who will actually answer the phone when the sample fails. That's not a marketing statement. That's the standard I use for my own orders.

If this checklist helps you avoid one $3,000 mistake, print it out. If it helps you avoid a $30,000 one, send me a note. I'd like to hear that the failures I paid for aren't going to waste.