1911 80% Tactical Machining Build, Part 10: GunKote Application

Now that you’ve finished your 1911, it’s time to make it pretty!  I went with GunKote since it is oven cured.  Disclaimer still.

I basically followed what I read in this thread.  I ended up doing it twice, first without sandblasting and the second time with sandblasting.  My preference is with sandblasting since it turned out to be a lot easier to do than I thought and with a much better end result.  My first time with just cleaning and K-Phos led to some premature wearing on some parts.

Preparation 1 (No Sand Blasting)

Cleaning Frame with Brake Cleaner
Cleaning Frame with Brake Cleaner

Went through and took apart everything down to just the bare slide and receiver.  You should be a pro at this after building it up yourself.  I then took it outside, put on my eye and breathing protection, along with some latex gloves, and blasted it twice with brake cleaner.  That stuff is nasty so be sure to do it in a well-ventilated area.  You want to get rid of all the oil since GunKote will not adhere correctly even if there is only the oil from you fingers.

I put the slide and receiver into the oven around 300 degrees for 15-30 minutes so any additional oil can seep out.  I then blasted it two more times.

I also bought K-Phos which is a pre-treatment for GunKote (I used green matte) since I didn’t have access to bead blasting.  I just dipped a clean rag into it and rubbed all the surfaces.  Then I let it sit for 10-15 minutes.

You’ll want the slide and receiver a little warm (around 100 degrees) when you apply the actual GunKote.  It was 100 degrees outside, but otherwise I would have popped it into the oven or used a heat gun.  I then strung them up.

Ready to Apply GunKote
Ready to Apply GunKote

I tested light coats on some cardboard first, and then just went for it.

OD Green GunKote
OD Green GunKote

The thread mentions that if you pop it into the oven it will make the whole house smell, but that if you let it dry a little, the smell is significantly less.  I left it outside for 3 hours and then strung it up in my oven.  I also read that the higher the temperature the stronger and darker it gets.  I ended up following a post where they went 375 degrees for 90 minutes.

The smell was definitely not too bad with just letting the windows open.

After the time was up, I just turned off the oven and let it return to room temperature.  Put a light coat of oil on everything and put it back together.  I had to work the thumb safety in a little as well as my rails because of the additional paint thickness.  Not too shabby!

Completed Tactical Machining 1911, minus sights
Completed Tactical Machining 1911, minus sights

Preparation 2 (Sandblasting)

Take everything apart and clean as much as you can with just regular gun cleaning solution.  I bought a cheap sandblasting kit from Amazon for $20 which worked great.  I also got some of the recommended 120 grit aluminum oxide off Ebay ($13 for 5 lbs).  I found that 5 pounds was enough if I captured the leftovers once.  If you just have virgin steel to blast, once through should be enough.

I made my own sand blasting cabinet from an old sturdy box, some clear plastic sheet I found in the garage, and by cutting two holes for holding the parts and the nozzle.

Homemade Sandblasting Cabinet
Homemade Sandblasting Cabinet

I borrowed a buddy’s air compressor which went up to 125 PSI with 1.5 BHP and 3 Gallon capacity.  It worked great as long as I let it keep above 90 PSI.  Here should be a good alternate from Amazon, or I’m sure good ole Harbor Freight will have some.

Have good eye protection, a good mask/respirator for the small particles that will fly out, and thick gloves for your hands.  I used a clamp for holding the parts when in the cabinet.

Inside View of Homemade Sandblasting Cabinet
Inside View of Homemade Sandblasting Cabinet

The end product looked great.  I went with sandblasting the beavertail and slide stop since I had some fitting work on them that exposed the bare metal.

Sandblasted 1911
Sandblasted 1911

After, I used the same procedure as before.

  • Wear gloves
  • Brake Cleaner
  • Oven to seep out oil
  • Brake Cleaner
  • Heat up parts
  • K-Phos
  • Spray in light coats
  • Let it sit outside for 2+ hours
  • Oven at 375 degrees for 90 minutes
  • Cool and lube
Completed Tactical Machining 1911, minus sights
Completed Tactical Machining 1911, minus sights


Part 1: Intro (Finding the 80%)

Part 2: Tools

Part 3: Parts List

Part 4: Basic Fitting

Part 5: Cutting the Slide Rail

Part 6: Barrel Seating

Part 7: Hammer & Sear Pin Holes

Part 8: Fitting the Slide

Part 9: Assembly & Fitting

Part 10: GunKote Application

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