Boeshield T-9 vs Paste Wax vs CRC 3-36 vs Camellia Oil: Rust Test in a Humid Shop
Boeshield T-9 vs Paste Wax vs CRC 3-36 vs Camellia Oil: Rust Test in a Humid Shop - A step into the workshop.
Stop Wasting Wood
Generate clear cut diagrams instantly with our new Cutlist Optimizer. Plan your cuts to make your next build easier.
Yo, let me tell you a story that ends with a cast iron top wearing a full coat of rust, overnight, in a shop where I pay way too much for a second bedroom that my landlord thinks is for guests.
It's not my saw, technically, this story. It belongs to a guy on the NC Woodworker forum, but I've lived some version of it. Spring day. Doors open. Warm, humid air doing its thing all day, then the temperature drops at night, and that big cold lump of iron sits there pulling moisture out of the air like a beer can sweating on a July porch. By morning: rust everywhere, with condensation "shadows" around everything that was sitting on the saw. He fixed it with 1200-grit wet/dry sandpaper, which I imagine was a great time.
That's the cast iron top problem in one paragraph. And the forums do not help.
Why the Forums Contradict Each Other (They Actually Don't)
Here's the thing. Read four threads and you'll find four winners.
Camellia oil won. Beat 3-in-One, WD-40, and a couple of LPS products. "Nothing works better at preventing rust on woodworking tools," per the piece. Meanwhile, in the comments there, a reader points to a different Fine Woodworking test from 2012 where, allegedly, CRC 3-36 "tops them all." On Woodworking Talk, a member ran Boeshield T-9 against Johnson Paste Wax on his cast iron top and found the paste wax glided like nothing else. Buffed-out Johnson's, and "the rip fence and miter gauge glide in their tracks," while T-9 left a noticeable drag. And a different commenter on a different thread swears the winner of a corrosion test was CRC 3-36, "beats WD-40 any day of the week."
None of these people are lying. They're measuring different things. That's the whole game.
One axis is corrosion: does the product keep water off the iron? The other axis is friction: does your workpiece and rip fence slide? Paste wax wins the second and loses arguments about the first. CRC 3-36 and camellia oil win corrosion arguments and nobody's bragging about fence glide on an oily film. Boeshield T-9 sits in between, positioned by its maker as a penetrator and moisture displacer first.
So I'm scoring both axes, separately, in a shop that holds humidity like a sponge.
The Test I'm Running
Four products, identical steel coupons, one humid Brooklyn room:
- Boeshield T-9 (paraffin wax in a solvent carrier, per Boeshield)
- Johnson-style paste wax (the benchmark the forum comparisons used)
- CRC 3-36 (non-drying oily film)
- Camellia oil
Half the coupon gets treated, half stays bare, so I've got a control strip on every sample. Then the fun part: I'm not just parking them in steady humidity. The NC Woodworker rust event happened overnight, from a temperature swing, so the test needs cold-coupon, warm-humid-air cycles. Iron top cold, humid morning air moving across it, repeat. That's the failure mode that actually eats tops in shops like mine.
Coupon notes get logged daily: first bloom of rust, then spread, on treated versus bare areas. And separately, drag. Rag friction and fence glide, tested before and after, because a top that doesn't rust but drags is still a bad top.
The Other Axis: What a Year Costs You
Rust protection you never reapply is a fantasy, so the money question is cost per year at each product's realistic reapplication pace.
The best picture of that pace comes from that NC Woodworker guy again. He tried paste wax first and gave it up because reapplying several times a week was "too much time and work." His switch was CRC 3-36, a thin coat after each shop session, three or so times a week, on one 16-oz can for over a year. "Nowhere near empty," he said. That's the routine cost baseline: one can of 3-36, a year, done.
Boeshield is a different shape of routine. The company says T-9's solvents evaporate over 4–24 hours to a thin paraffin film, and their guidance for a light film is spray on, wipe off excess immediately. So the labor is real: spray, wait a beat, wipe immediately, then let it finish drying.
Camellia oil pricing is the one I can pin to the penny: The Rust Store sells its 8-oz Japanese-imported bottle for $24.99, describing it as a very light natural seed oil that's "not likely to dry and gum up."
Paste wax is the problem child for costing. Johnson's is the benchmark the forum comparisons used, and forum threads report Johnson's discontinuation — rusted-out 30-year-old cans, plastic replacements — but no manufacturer page confirms current specs, so I can't quote a price or reapplication interval I haven't verified. What I can say from the Woodworking Talk comparison is that it was the lowest-friction finish tested and, per the NC Woodworker experience, the highest-labor one at high-humidity reapplication rates. You'll price your own can. That's honest.
What Each Product Is Actually For
Reading the manufacturer pages, you can see the philosophy differences.
CRC 3-36 is an oily, non-drying film, per CRC Industries, running 0.025 to 0.075 mils thick, good from -50 to 250°F, NSF H2 registered. It "drives out water, fights corrosion." The catch, and it's a big one for a saw top: the film is oily and non-drying, and CRC says removal takes mineral spirits or contact cleaner. It will transfer to a workpiece if you go heavy. Also, heads up: check which sizes your supplier actually still carries before you plan a year's routine around one can.
Boeshield T-9 is a Boeing development from over 40 years ago, solvent-plus-paraffin, most effective between 32–150°F, CO2-propelled. The manufacturer doesn't publish a longevity number. That's not dodge; it genuinely depends on how much you use the saw.
Camellia oil has the most dramatic credential: nine months of salt-sea air on a boat, per Fine Woodworking, with best-in-test protection and no sticky residue. If it can survive a sailing ship, a Brooklyn shop with a landlord-issue radiator is theoretically easier. But that's one anecdotally-reported comparison, not a coupon study, which is exactly why I'm running coupons.
Paste wax is the friction king with a labor problem, full stop.
My Prediction, Check Me on It
If I had to bet: CRC 3-36 and camellia oil protect the bare/treated boundary the longest in the humidity cycles, paste wax has the best glide but needs the most reapplication to keep up in a humid shop, and T-9 splits the difference if and only if you wipe it right. That last one matters. The T-9 complaints I found on forums read like heavy-coat complaints, and the manufacturer's own rep, per the forum poster, says heavy coats are wrong for tables.
The real takeaway, before any coupon finishes its first week: pick the axis you care about. Nobody's product wins both. The NC Woodworker guy found his answer in a thin coat of 3-36 after every session and never saw rust again. That's a cheap, boring, effective answer, and boring is what you want from rust prevention.
I'll report back when the coupons do. Meanwhile, if you've got a cold iron top and humid nights, close the windows and wipe your saw down tonight. Tomorrow it's a 1200-grit problem.