Blue coating a gun provides a protective finish to the inner steel case. This operation may require knowledge and experience.

So, it is not easy for beginners to succeed with this operation. To make it easier for you to approach, we will show how to reblue a gun in the article below.

Let’s check it out!

How To Reblue A Gun? 5 Simple Ways To Follow



Preparation is always one of the factors that make up the success of any job. Of course, reblue a gun is no exception. Here are a few things to keep in mind.

First, remove the gun parts to avoid spreading the bluing layer to unrelated areas. Accordingly, your gun will lose a lot of aesthetics.

Next is the cleaning of the metal surface. If the gun is cleaner, the beauty after spraying will increase.

You can use specialized cleaning solutions for metal to remove the rust layer. Finally, do not forget to dry the surface thoroughly with a clean towel.

One trick is to use a hair dryer to remove the steam and shorten the cleaning time ultimately. Besides, sun drying to promote drying is also an intelligent choice. To prevent dirt from accumulating, wipe the surface of the gun again.

Items You Need 

Besides the preparation for the preparation of the gun, you also need to add some other extra items.

We cannot guarantee the best results if you do not meet one of the conditions below. All my most basic recommendations include:

  • Rust remover: Naval Jelly might be the top recommendation.
  • Caustic salt mixture: To aid in metallurgy
  • Clean water: Cleaning in the process
  • Dryer: Shorten the bluing drying time
  • Tools for cleaning guns
  • A large pot to store the above items
  • A clean, dry location with a stable temperature.

How To Reblue A Gun?

Common ways to follow
Common ways to follow

Without making you wait long, here are the ways to reblue a gun overview. Accordingly, choose the one that is suitable and convenient for you in the 5 ways below.

Cold Bluing

With this first step, the chemical selenium oxide is the main ingredient for you to start cold bluing into each weapon part.

You should pour the initially prepared chemical into the pot and let the parts soak, and wait until there is a change from the metal.

The process only takes a few minutes. You use the tool to remove the metal from the solution. Do not forget to use a dryer to dry the gun surface for a long time.

Hot Blue

To perform the hot blowing process, use a solution of sodium hydroxide, also known as caustic soda, in boiling water.

The trick to successfully performing this stage is that the water temperature should be higher than the heat gun.

In addition, the entire metal must be submerged in the above alkaline solution.

Once completed, a black coating will appear on the metal parts you have treated.

I feel the durability of this hot solution is superior to cold bluing. Of course, the price you must pay to implement is also higher.

Nitre Bluing

Next is the process of coloring the metal weapon. The specific step is putting the chemicals and the step I initially asked for in the pot in the preparation step.

Then it would help if you had high heat to accelerate the process. Ideal conditions are around 600°F.

The mark of completion is a distinct blue color on the metal plates in the water basin. Once there, you lower the temperature, take out each part, and then wipe everything dry.

To prolong the paint’s life, I advise only doing this stage on stationary parts.

Charcoal Bluing

Because of its safety and implementation, the charcoal spraying technique has always been the choice of many people. The only thing that you must have is a high temperature.

The detailed step is that you will wrap around the gun part (disassembled) with many aspects of fiery hot charcoal. After the metal is hot, use the puller to pull it out and start rubbing it with the black stone.

Everything is not done just once. The problem of repetition is imperative for you, so be patient until you get the results you want. Do not sit in a closed room to perform these steps. Hazards in the air can lead to dangerous death.

We must also warn you that this method is not guaranteed in the long run. Usually, after a while, everything will return to the way it was.

Heat Bluing

Finally is the top solution in metallurgical history. The mechanism here is to use heat to change the color of the gun.

The point I love most when doing heat bluing is that the tools can be rudimentary. You can perfectly reblue a weapon with just a regular torch.

Just maintain the heat, and the color change of the gun will quickly appear before your eyes.

However, I have to admit that this method does not provide lasting results over time. The heat applied to the metal can change the structure of the weapon.


While researching and practicing how to reblue a weapon, I noticed many unanswered questions regarding this. So I will dedicate this part of the article to answering your questions.

How does blue prevent rusting?

One of the most effective anti-rust methods that I often use is polishing.

This prevents rust stains from sticking to the metal and spreading to neighboring areas. Do not forget to apply more cooking oil or spray waterproof paint to prevent the ability of water from sticking.

If you follow the instructions above, the rust won’t come to your bluing.

Can you put a new blur over an old blur?

Put a new blur over the old one
Put a new blur over the old one

The short answer is that you absolutely can put a new one over the old blur.

For bluing that has just oxidized or, in other words, you have not seen much rust through the naked eye; you can apply Rustblue directly to the old layer.

Accordingly, the new blur will create a new protective layer and a texture identical to the old blur.

Should I reblue an old gun?

Reblue an old gun doesn’t matter if you like to collect guns. This refresh will also lose the original nature of the weapon.

In terms of value, sometimes, the old gun is worth more than the reblue version.

What is a blue liquid made of?

Iron powder and water are mixed in the bluing component to form a viscous liquid solution. In addition, the manufacturer of this glue also adds some substances, such as a pH-balanced solution.

There are even disinfectants in the product. Accordingly, preventing the accumulation of algae and bacteria helps the weapon to last for a long time.

What is blurring fluid?

You can call blurring fluid a paint powder with many unique uses. One of them is used to reblue a weapon.

According to the results, the sturdiness of this substance is quite excellent. The solution can be used for personal care and as a resource for scientific projects.

Final Words 

At the end of this article, I hope you can master some simple ways and essential skills on how to reblue a gun.

This action will require you to practice for a while to master, so don’t be too hasty! Try to follow slowly step by step in my guide to avoid making unnecessary mistakes. Good luck!

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