If you’re wondering how to paint garage walls, I recently tackled our entire three-car garage with 9 1/2-foot ceilings, a paint sprayer, and what ended up being 10 gallons of primer. It was a big project, but painting the unfinished drywall completely changed how clean and finished our garage feels.
My original plan was to prime everything and then paint the walls and ceiling white. But once the primer dried and I saw how good the garage looked, I decided the additional cost of paint wasn’t worth it for what I wanted out of the space.
Here’s exactly how I prepped and painted our garage walls, the paint sprayer that made the project significantly easier, how much primer I used, and what I would do differently next time.
What I Used to Paint Our Garage Walls
Our garage is larger than average. We have a three-car garage with approximately 9 1/2-foot ceilings, so keep that in mind when comparing the amount of primer I used to what you might need for your own garage.
Here are the supplies I used:
- Graco Magnum 257025 Project Painter Plus Paint Sprayer
- Painter’s plastic
- Painter’s tape
- Primer — I used approximately 10 gallons
- Ladder
- Vacuum and cleaning supplies
The Paint Sprayer I Used for Our Garage
Before starting this project, I knew there was absolutely no way I wanted to roll our entire garage.
Between the three-car garage and 9 1/2-foot walls, rolling the walls sounded miserable enough. Then I thought about rolling the entire ceiling and immediately started looking for a good paint sprayer.
I bought the Graco Magnum 257025 Project Painter Plus Paint Sprayer, and it was literally worth every penny.
For a project this large, having a sprayer made a huge difference. There was still a lot of ladder moving involved, especially when I got to the ceiling, but I cannot imagine how much longer this would have taken me with a roller.
How to Paint Garage Walls
Here’s the process I used from clearing out the garage through putting everything back together.
Step 1: Declutter the Garage Before Painting
Before I painted anything, I went through everything in our garage.
This is probably not the part anyone gets excited about, but if you’re already going to move everything away from the walls, it’s the perfect time to get rid of things you know you’re never going to use again.
It can feel daunting when you first start, especially if your garage has accumulated years of random stuff. But I knew I didn’t want to spend time moving things, covering them in plastic, painting around them and then putting them back into the garage when we didn’t even want them anymore.
So before doing anything else, I decluttered.
Trash went in the trash, things we no longer needed were removed, and only the things we actually wanted to keep stayed in the garage.
Step 2: Move Everything Away From the Garage Walls
Once I had narrowed everything down to what we were keeping, I moved it all away from the perimeter of the garage.
You need enough room to comfortably move around the walls with your paint sprayer, and you definitely don’t want to be squeezing between your belongings and wet primer.
I moved everything toward the center of the garage so I had a clear path around the entire perimeter.
Step 3: Cover Everything With Painter’s Plastic
This is one step I would not skimp on.
I covered everything we were keeping with painter’s plastic before I started spraying.
When you use a paint sprayer in a garage, there is going to be overspray and airborne paint or primer particles. Cover far more than you think you’ll need to.
And even with everything covered, I still had a lot of cleanup afterward. More on that later.
Step 4: Tape Off Everything You Don’t Want Painted
Next, I went around the entire garage and covered or taped anything I didn’t want sprayed.
For us, that included things like:
- Outlets
- Light switches
- Fixtures and other areas I didn’t want painted
- The exposed concrete around the bottom of our garage
Our garage has approximately one foot of exposed concrete along the bottom of the walls, so I covered that area to protect it from overspray.
My general rule with a paint sprayer is that if you don’t want paint on something, assume paint can find its way there and cover it.
The prep takes time, but it’s much easier than trying to remove dried overspray afterward.
Step 5: Start With Primer
Once everything was protected, I could finally start spraying.
I used primer on all of the unfinished garage drywall and ceiling.
Because our garage is so large, I ended up using approximately 10 gallons of primer to get the coverage I wanted.
Your garage may need significantly less. The amount you’ll need depends on your square footage, ceiling height, drywall, application method and the particular primer you’re using.
Step 6: Paint Everything You Can Reach From the Floor
I tried to make the process as efficient as possible.
Instead of immediately climbing up and down a ladder, I first went around the entire garage with the sprayer and painted everything I could comfortably reach while standing on the floor.
This allowed me to move relatively quickly around the perimeter.
I wasn’t constantly repositioning a ladder or climbing up and down while working on areas I could already reach.
Once the entire lower portion was finished, I moved on to the higher sections.
Step 7: Use a Ladder for the Upper Garage Walls
Next came the ladder.
I went around the garage again, this time spraying from where I had stopped during the first pass all the way up to the ceiling.
With 9 1/2-foot ceilings, there was no way around using a ladder for this portion of the project.
This part was obviously slower because I had to continually move the ladder as I worked my way around the garage.
And then came the ceiling.
Step 8: Spray the Garage Ceiling
This was easily the most tedious part.
I had to move the ladder what felt like every 30 seconds so I could spray every section of the ceiling.
Move ladder.
Climb up.
Spray.
Climb down.
Move ladder.
Repeat approximately one million times.
Okay, maybe not literally... but it certainly felt like it.
This is also the part that made me especially glad I bought the Graco sprayer. Rolling a ceiling this large from a ladder would have made an already tedious job much worse.
How Long Did It Take to Paint Our Garage?
It took me approximately three hours to spray primer over the entire garage, including the walls and ceiling.
That doesn’t include all of the prep work beforehand or the cleanup afterward.
Considering the size of our garage, I was really happy with how quickly the actual spraying went.
The paint sprayer was absolutely the reason I could get that much surface area covered in a few hours.
Do You Have to Paint Over Primer in a Garage?
Here’s where my project took an unexpected turn.
My original plan was:
Primer → white paint → finished garage.
But after the primer dried, I looked around and thought…
Why am I painting over this?
The drywall was completely covered. I couldn’t see any drywall peeking through. The garage looked bright, white, clean and dramatically more finished than it had before.
And ultimately, it’s a garage.
I wanted the walls to look white and clean. The primer had already given me the aesthetic result I wanted.
The other consideration was cost.
I had spent around $120 on the primer, and buying approximately 10 gallons of the paint I was considering would have cost me another $420.
I couldn’t justify spending another $420 when I was already happy with how the garage looked.
So I stopped.
I did not put regular wall paint over the primer.
Can You Leave Garage Walls With Just Primer?
Technically, primer and finish paint serve different purposes. Primer is designed primarily to prepare and seal a surface for paint, while finish paint is generally formulated to provide the final appearance, washability and durability.
So I’m not saying that primer is universally a replacement for paint.
I’m simply telling you what I decided to do in our garage.
For me, the question became whether spending another $420 was worth it to get a more durable finished surface in a space where I was primarily concerned about making the unfinished drywall look clean and white.
For now, my answer was no.
I’m actually interested to see how it holds up.
If the walls become dirty, difficult to clean, scuffed or start looking worse over time, I’ll come back and update this post. And if I eventually decide they need a coat of actual paint, I can always paint them later.
But for now, I’m completely happy with how the primed garage walls look.
One Thing I Wasn’t Prepared For: The Dust
If you’re researching how to paint garage walls with a sprayer, this is the part I really want you to know about.
There was dust everywhere.
Even though I covered our belongings with painter’s plastic, spraying that much primer created a fine residue throughout the garage.
The good news was that the primer dust came off our things really easily.
The bad news was that cleaning it up was extremely tedious.
After I finished painting, I needed to vacuum the entire garage and wipe down surfaces to remove the residue.
If I were doing this again, I’d still absolutely use the sprayer because of how much time it saved me on the actual painting. But I would go into the project knowing that spraying faster means spending some of that saved time cleaning afterward.
Cover everything thoroughly, even if it seems far away from the area you’re spraying.
Step 9: Remove the Painter’s Tape and Plastic
Once I was finished and everything had dried appropriately, I removed all of the tape and painter’s plastic.
There is something incredibly satisfying about pulling all of that plastic down and finally seeing the finished space.
I threw away all of the used masking materials and then tackled the dust and overspray cleanup.
Step 10: Move Everything Back and Organize the Garage
Finally, I moved everything back into place.
But since I had already emptied, decluttered and moved basically everything we owned in the garage, I figured I might as well go all the way.
So I organized EVERYTHING.
But that’s a post for another day.
Was Buying a Paint Sprayer Worth It?
For our garage, 100 percent yes.
The Graco Magnum 257025 Project Painter Plus Paint Sprayer was one of those purchases where I wondered beforehand whether I really needed another tool.
After painting a three-car garage with 9 1/2-foot ceilings?
Yes. Yes, I did.
The sprayer allowed me to cover a massive amount of wall and ceiling space relatively quickly. The actual priming portion of this project took me around three hours.
There was additional setup and cleanup involved, but I would still choose the sprayer over rolling this garage if I had to do the entire project again.
How Much Primer Do You Need to Paint Garage Walls?
I used approximately 10 gallons of primer for our three-car garage, including the walls and ceiling.
I would not use that number as a universal recommendation because garages vary dramatically in size.
A standard two-car garage with lower ceilings could obviously require substantially less than our large three-car garage with 9 1/2-foot ceilings.
The coverage listed on your specific primer is a much better way to estimate how much you’ll need. Measure the approximate surface area you’re painting and compare that against the manufacturer’s stated coverage, allowing for the condition and porosity of your drywall.
Should You Roll or Spray Garage Walls?
Having now sprayed ours, I would choose the paint sprayer again for a large unfinished garage.
Spraying was fast and made tackling the ceiling much more realistic for me.
The tradeoff is prep and cleanup.
With a roller, you don’t have nearly the same amount of airborne overspray to deal with. With a sprayer, you need to be meticulous about covering everything you don’t want painted.
For our large garage, the speed was worth that tradeoff.
Tips for Painting Garage Walls
After painting our entire garage, these are the things I’d keep in mind:
- Declutter first. You’re already moving everything, so take advantage of the opportunity.
- Move everything away from the walls. Give yourself plenty of room to work.
- Cover more than you think you need to cover.
- Tape outlets, switches and anything else you don’t want sprayed.
- Plan for overspray and dust. This was the biggest downside of using a sprayer.
- Work efficiently. I sprayed everything I could reach from the floor before getting the ladder involved.
- Expect the ceiling to take patience.
- Follow the instructions for your particular primer and paint sprayer, including ventilation, protective equipment, application and drying requirements.
- Don’t assume primer and paint are interchangeable. I personally chose to stop after primer because I was happy with the result and understood that it may not be as durable or washable as finish paint.
Was Painting Our Garage Walls Worth It?
Absolutely.
Painting the garage walls was one of those projects that wasn’t particularly exciting while I was in the middle of it, but the finished result made the entire garage feel dramatically cleaner and more intentional.
If you’re trying to figure out how to paint garage walls, my biggest advice is to spend the time preparing the space correctly and seriously consider a paint sprayer if you’re dealing with a large garage or high ceilings.
The Graco Magnum Project Painter Plus made our three-car garage manageable, and even though moving the ladder around the ceiling was tedious and the cleanup afterward wasn’t fun, I’d still do it this way again.
And for now, I’m also completely happy with my controversial decision to leave the walls primed instead of spending another $420 on finish paint.
We’ll see if future me agrees.
I’ll update this post as the garage gets more use and let you know how the primer-only finish holds up over time.
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