How To Refill a Fire Extinguisher With Paint?

If you’re planning to refill a fire extinguisher with paint, you should first determine if you need an extinguisher to store your paint, as not all paint is dangerous. You could be fine if you have shelves full of open paint tins in your shed after you’ve finished decorating your house. 

Over 80% of household paint is water-based, which means it isn’t flammable. It’s worth double-checking your paint cans to see if they’re solvent-based, in which case an extinguisher may be necessary.

Paint used in an industrial or commercial environment, on the other hand, is more likely to be flammable, necessitating the use of a fire extinguisher.

Which Fire Extinguishers Can I Use?

Flammable paints will be exposed to flammable liquids, fuel, and spirits in a Class B fire. That implies a foam or dry powder extinguisher, as well as CO2 extinguishers, can be utilized. 

As a result, it’s critical to keep a proper extinguisher on hand in case a little fire gets out of hand.

Extinguishers will all specify which kind of flames they can put out, so double-check yours if you already have one.

It’s also a good idea to have a dry powder or CO2 fire extinguisher available while applying spray paint. Before applying spray paint, keep any possible sources of ignition away from the cans and make sure the environment is safe.

Storing and Using Flammable Paint

As with any flammable substance, the quantity you store at one time should be kept to a bare minimum. Rather than having a bulk load, consider simply carrying enough for what you plan to utilize at one time. There are additional measures you may take if it is inevitable.

You might, for example, utilize steel flammable storage cabinets. They’re designed to keep flames away from the liquid inside for around 30 minutes. This allows you plenty of time to leave a building and summon the fire department before the fire spreads further.

If the paint you’re using is combustible, it’s conceivable that it’ll emit a vapor that’ll endanger your health, so make sure you use a respirator or disposable mask when using it.

If you’re utilizing flammable paints in your business, make sure everyone is as safe as possible. Make sure you have the proper equipment and that it is in good operating order on a regular basis.

Filling a Fire Extinguisher with Paint

Anarchists in Montreal have used paint-filled fire extinguishers to oppose gentrification, surveillance, and, most recently, colonial advertising. They are very popular among the new artists nowadays. Let’s have a look at how we can fill the fire extinguisher with paint to make a giant spray.

1. Find the Extinguisher

Locate a water-based fire extinguisher. They’re silver metallic and available in two sizes.

Both sizes feature detachable tops that are usually held in place with a nut.

The bigger capacity is 9 L and features a Schrader valve, like your bike tire, for easy pressurization. It may be found in a variety of places, including institutions, residences, and office buildings.

The smaller version is 6 L and requires an air compressor to repressurize. It’s only seen at restaurants since it’s used to put out grease fires, and it’s often located near the rear exit!

2. Empty the Water

To avoid getting your prints all over the place, wear cotton gloves. Ensure that the pressure gauge on the fire extinguisher reaches 0 psi by spraying water out of it. This is something we normally perform in an alleyway, but it can also be done in your bathtub.

3. Fill with Paint

Remove the nut as well as the top portion.

Fill the extinguisher halfway with a combination of latex paint and water in equal parts. This will create a balanced suspension and a saturated form of liquid to be sprayed. 

The amount of water and paint should be your focus if you are serious about making a giant spray paint with the fire extinguisher and are planning to use it on a larger scale. If the amount of water becomes more than the paint, it will make it more dilute than the expected density we are trying to achieve for painting. 

Similarly, if the amount of paint becomes more than water, it will also create a mess by being denser than the expected quality and the paint would not be sprayed perfectly on the surface you will be working with it. So be careful while filling the paint in the extinguisher. 

4. Pressurize

Re-attach the top portion and tighten it up.

Use a bike pump to pressurize the 9 L until the gauge reads 100 psi.

There is no Schrader valve on the 6 L, so you’ll need an air compressor, which can be obtained at hardware stores or most pawn shops. Remove the hose and use a 3/8†male adaptor to connect the air compressor tube.

Set the air compressor to 115 pounds per square inch. It’s possible that you won’t even need to compress the extinguisher’s handle for the pressure to steadily rise to 100 psi. Remove the safety pin and gradually depress the handle if you need to. To avoid paint getting into the tube, stop when the pressure hits 100 psi.

Return the safety pin and duct-tape it in place.

5. Clean

To erase any fingerprints, use a towel soaked in rubbing alcohol. Clean any type of paint marks or dirt to avoid any kind of mess around your working area. It will help you to do your work with more concentration and without facing any kind of difficulty while working.


You can fill the paint in the fire extinguisher and can work on a larger scale much more easily than working with small spray paint bottles. Using small bottles will take much more effort and will be very time-consuming. So if you want to experience this cool painting technique, follow the instructions mentioned above carefully and enjoy your work.