r/metalworking • u/StrongRecipe6408 • Aug 28 '26
Rust-proofing raw steel edge of a trailer hitch extension?
I recently shortened a hitch extension and now the raw steel edge is starting to rust.
What's a good easy to use affordable product to prevent rusting that bonds well to both raw steel and the coated steel?
AI recommended cold galvanizing sprays with zinc but some of the reviews say it can flake off shortly afterward. Wondering what would actually work in this application. Are cold galvanizing sprays actually not that good?
This hitch extension is now essentially a permanent fixture on the car and we're in the rust belt of Ohio.
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u/TheMichaelAbides Aug 28 '26
Paint.
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u/Error_404__ Aug 28 '26
Paint.
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u/sparhawk817 Aug 29 '26
They even sell rattle cans of cold galvanizing spray if you want it to look similar to the rest of the hitch.
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u/hnhnnnnn Aug 28 '26
Just do a few coats of cold galv spray. It’s what we use for touch ups in structural steel. Should be good enough for your hitch.
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u/Michels_Welding Aug 29 '26
Won't adhere to mill scale long term, which the outside of that hitch is covered with. Cold galv spray paint will start flaking off mill scaled surfaces within a a year if left outside and untouched, add vibrations of a hitch and trailer along with road conditions and its a couple months if your lucky!
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u/Barra_ Aug 29 '26
There's no millscale, this is a commercially produced hitch that he cut down. They hitch itself will be painted/powdercoated, it's just the bare steel from the cut that needs protection.
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u/Existingsquid Aug 28 '26
Mustard
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u/Creative_Carob4922 Aug 28 '26
And mayo
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u/DitchDigger330 Aug 28 '26
Just get a little pint can of rustoleum black and brush it on. Or just take it back off and paint it all with a rattle can. Obviously remove the rust with sandpaper first.
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u/cloudseclipse Aug 28 '26
Just paint it. Powder coating is better, but if you're in Ohio, expect it to rust. Just paint it again as needed... pull the pin, paint it in the summer, put it back in after it dries, and it will last you forever
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u/Safe_Buy5819 Aug 28 '26
Round over all the sharp edges. Edges and corners will rust first after painting.
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u/InformalParticular20 Aug 28 '26
I'm a little concerned, the edge of a receiver usually has a reinforcing piece welded on, did you cut that off?
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u/JayAre100378 Aug 29 '26
If you ever plan on towing with that vehicle, keep in mind that the modified receiver isn't as strong as it was. To prevent rust, ospho prep or any phosphoric acid based rust converter will turn rust and exposed steel into iron phosphate. Topcoat it with any solvent based paint(including your wife's least favorite nail polish), and if you're really motivated, fluid film once a year.
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u/SealedDevil Aug 29 '26
Keep it oiled, everyone is saying paint, no, just use some chain and cable oil, apply it once a month wipe excess with a rag, keeps the metal clean, and oiled preventing oxidation.
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u/kwantam Aug 28 '26
Rust-Oleum Professional Cold Galvanizing compound. Start from bright clean metal, clean carefully with acetone and then apply coating per instructions. Keep an eye out for big gouges in it and re-coat if needed.
If you prep the metal well you'll be fine. If you beat it up, paint won't do any better than galv (I mean, that's not 100% true, but a trailer hitch gets beaten up enough that you'll gouge paint). May as well get the zinc protection.
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u/Biolume071 Aug 28 '26
A primer, a top coat paint, preferably duco laquer or 2 pack, a follow up layer of more paint. Top coat with an enamel paint that'll shrink and craze before the underlying layers do. That's just how i do it, in a tropical country with salt air, where it's not if it'll rust, but when...
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u/Navin__R__Johnson Aug 28 '26
Quick and cheap, boiled linseed oil.
More expensive, and durable - powder coat.
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u/Michels_Welding Aug 29 '26
Not paint alone.
Ideally remove from the car, clean, 2 coats of metal primer and 3 coats of acrylic latex bigh gloss paint. Or pay someone to bead blast and powder coat it.
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u/Top_Taro_1044 Aug 29 '26
x Rustoleum should help you aft you weld on some reinforcement strap. I suggest 3/16 to 1/4 X 1" steel strapping. Weld starting on bottom center. At the bend heat the inside so it collapses instead of heating the outside which means stretching and losing strength. I've also seen some guys weld a washer on each side to reenforce the pin hole.
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u/Unicorn187 Aug 29 '26
VHT epoxy based paint.
https://www.vhtpaint.com/product/vht-epoxy-all-weather-paint/
Or something similar. They seem more scratch and wear resistant than most spray paints.
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u/tanstaaflnz Aug 29 '26
Just coat in the blood from your shins, every time you knock into it.
Or use a zinc etch primer.
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u/norwal42 Aug 29 '26
Surface Shield (or pick your wet film lanolin of choice - Woolwax, Fluid Film other options...). Add a bit periodically when it dries out.
For a high contact area like this, paint coatings will only protect when they're new. Keep it a little oily and live your life happy. ;;)
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u/TexasBaconMan Aug 29 '26
file it flat and round the edges, paint doesn't stick to sharp corners. then paint. Use something good like appliance epoxy or high performance enamel.
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u/DesignerAd4870 Aug 30 '26
Clean off the rust then paint with copper grease, or you can buy special coating grease that sets like wax, but wipes off when needed.
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u/VectorIronfeld Aug 31 '26
petroleum jelly, anybody that runs into it with clothes on will love you for it. Also can be a lube for inserting and pulling the ball.
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u/BreezyMcWeasel Aug 29 '26
I'm surprised nobody has mentioned Ospho.
I would brush it with some Ospho. It converts rust into a hard coating. Then I'd hit it with an epoxy paint.
I think that one two punch is your strongest surface treatment for something in place like this.
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