Step By Step Guide
Painting your Jeep differential covers is an easy way to add a little personality while also protecting bare metal from rust.
When I upgraded my factory differential covers, I chose Riddler Manufacturing covers because I wanted something stronger for rock crawling. They are made from high-grade ductile iron and use a lip-free design with recessed fasteners, which helps reduce snag points on rocks.
Mine arrived bare, which meant I could finish them exactly the way I wanted.
And of course, I went with purple.
Quick Answer: How Do You Paint a Differential Cover?
To paint a bare Jeep differential cover:
- Smooth rough areas and scuff the surface.
- Clean the cover thoroughly.
- Apply a self-etching automotive primer.
- Spray two to three light coats of paint.
- Add any accent color.
- Finish with several coats of clear coat.
- Let everything cure fully before installation.
The biggest key is prep. Paint will only hold up as well as the surface underneath it.
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| Unpainted Diff Covers |
Read More ➤➤ Step-By-Step Diff Cover Swap
Why I Painted My Differential Covers Instead of Powder Coating Them
A few people suggested that I powder coat my new diff covers.
I thought about it, but I chose regular spray paint instead.
Why?
Because I like to crawl on rocks.
That means these covers are going to get scratched and dinged eventually. Spray paint makes touch-ups much easier because I can clean the damaged area, scuff it, and spray it again without trying to match a powder-coated finish.
For a Jeep that spends time on rocky trails, that was more practical for me.
What I Used
My basic supplies included:
- Sandpaper or grinding tools for smoothing rough areas
- Acetone or another appropriate metal cleaner
- Clean shop rags
- Tack cloth
- Automotive self-etching primer
- Spray paint in your chosen color
- Small detail or model paint for accents
- Clear coat
- Gloves and eye protection
Self-etching primer is designed for clean bare metal and helps the topcoat adhere better.
Step 1: Smooth and Scuff the Differential Cover
The first thing I did was smooth the rough areas on the bare covers.
At the time, I was working in a fabrication shop, so I had access to the right tools and people who worked with steel, aluminum, and bronze every day. They helped me get started and gave me some good tips.
You do not need to aggressively grind the entire cover.
The goal is to:
- Remove any rough casting spots
- Knock down sharp edges if needed
- Scuff the surface so the primer has something to grip
- Leave the machined sealing surface alone
That last part is important. Do not grind or paint the surface that seals against the axle housing.
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| Jeep Momma Sanding diff covers. |
Watch ➤➤ Jeep Momma Sanding her diff cover
Step 2: Clean the Surface
Once the surface was ready, I cleaned the covers thoroughly.
I used acetone.
The important part is removing:
- Dust
- Grinding residue
- Oil
- Grease
- Fingerprints
Any contamination left behind can affect how well the primer and paint stick.
After cleaning, avoid touching the bare metal with your hands as much as possible.
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| cleaning of sanded diff cover |
Step 3: Apply Self-Etching Primer
Next came primer.
I used an automotive self-etching primer because the covers were bare metal.
Self-etching primer is made to bond to bare metal and create a better surface for the paint that goes over it.
Apply light, even coats and follow the instructions on the specific can you are using.
I also used a tack cloth before painting. I was a little hesitant about that step at first, but it worked really well for picking up tiny bits of dust before the color coat went on.
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| Self-etching primer |
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| primed diff covers |
Step 4: Paint the Differential Covers
Now for the fun part.
I sprayed on two to three light coats of color.
Mine was Sumptuous Purple.
Several light coats work better than trying to get full coverage in one heavy pass. Heavy coats are more likely to run, sag, or take longer to cure.
Take your time and let each coat flash according to the paint manufacturer's directions.
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| purple painted diff covers |
Step 5: Paint the Accents
Once the main color was dry, I used black model paint for the raised accents.
This is completely optional, but I liked the contrast.
If your diff cover has raised lettering, a logo, or other details, this is an easy way to make them stand out.
A small brush gives you much more control than trying to spray the accent color.
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| Close up of purple painted diff cover |
Step 6: Add Clear Coat
After the accent paint dried, I added three to four coats of clear coat.
The clear coat adds some protection and gives the finished covers a more complete look.
It will not make the paint rock-proof.
Nothing really does.
If you use your Jeep off-road, especially around rocks, expect scratches eventually.
That is also why I am glad I chose spray paint. Touch-ups are simple.
Should You Paint or Powder Coat a Differential Cover?
Both can work.
Powder coating generally gives you a durable, professional finish, but spray paint has one big advantage for an off-road Jeep:
It is easy to repair.
If I scrape one of my covers on a rock, I can clean the area, scuff it, and touch it up.
For me, that mattered more than having the toughest-looking finish when the covers were brand new.
What I Learned From Painting My Diff Covers
The biggest lesson was that the actual spraying was the easy part.
The prep mattered more.
If I were doing another set today, I would focus even more on:
- Cleaning the surface thoroughly
- Keeping my hands off the bare metal after cleaning
- Using multiple light coats
- Giving the paint plenty of time to cure before installation
I would still choose spray paint for a Jeep that sees rocks because I like being able to touch it up myself.
How Well Did the Painted Diff Covers Hold Up?
The honest answer is exactly how I expected them to.
They looked great, but rock crawling eventually leaves marks.
That did not bother me.
A differential cover is there to protect the gears inside, and if the cover takes a scrape instead of something more expensive getting damaged, it is doing its job.
The nice part about painting them myself is that those scratches are easy to fix.
Frequently Asked Questions About Painting Differential Covers
What kind of paint should I use on a differential cover?
An automotive or durable metal spray paint works well when used over the proper primer. The most important part is preparing and cleaning the bare metal first.
Do you need primer before painting a differential cover?
If you are painting bare metal, yes. A self-etching automotive primer helps improve adhesion and corrosion resistance before the color coat is applied. Rust-Oleum
Can you paint a differential cover while it is still on the Jeep?
You can, but I would rather remove it.
Removing the cover makes it easier to clean, prep, paint evenly, and keep overspray away from the axle, suspension, brakes, and other components.
Should you paint the inside of a differential cover?
I would not paint the inside unless the manufacturer specifically recommends a compatible coating.
The inside is exposed to gear oil, so I prefer to leave it in its original finish.
Can you paint the sealing surface of a differential cover?
No.
Keep paint, primer, and grinding tools off the machined sealing surface where the cover meets the axle housing.
Is powder coating better than spray paint for a diff cover?
Powder coating can provide a very durable finish, but spray paint is much easier to touch up after rock damage.
For my Jeep, that made spray paint the better choice.
How many coats of paint should I use?
I used two to three light coats of color and three to four coats of clear.
Always follow the drying and recoat instructions on the products you are using.
More Jeep Momma Tips
A natural lead-in could be:
If you are working on your axles or getting your Jeep ready for more trail time, these Jeep Momma guides may help too:
Suggested internal links:
Disclaimer: Any advise and information provided on this blog should be verified by professional sources prior to making any changes or modifications to your vehicle.
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