Dihydrogen Monoxide Projectile Weapons




About: For more about my costumes, crafts and general craziness, check out my blog: http://modmischief.blogspot.com/

Be prepared to fend off airship pirates or even the dreaded air kraken!

Mod some cheap water guns to give them a steampunk look with little more than paint.

Step 1: What You'll Need

We found some cool water guns for $10 at Walmart but we weren't happy with the Super Soaker colour scheme.

To give the guns a bit more style you'll need:
  • Primer or spray paint for plastic
  • Acrylic craft paints (black, brown, silver & bronze)
  • Spray on clear coat or sealer
  • Paintbrushes
  • Sandpaper
  • Drywall compound
  • Masking tape
  • Scraps of pleather and interesting plastic bottle (optional)

Step 2: Prep the Guns

Prepare the guns for painting by removing any stickers and sanding. According to the can, it is not necessary to sand plastic before painting it with Krylon Fusion paint, but we wanted to rough our guns up a bit and remove some of the raised lettering.

Fill the screw holes with joint compound and sand the gun again lightly after the putty has dried.

Use masking tape to cover up any important moving parts or openings.

Step 3: Prime Time

Give the guns a nice coat of primer or plastic paint.

The Krylon paint we used recommended waiting a week for the paint to become chip proof, so we set the guns somewhere safe and waited until the following weekend.

Step 4: Let Out Your Inner Artist

Once the base coat has properly set, it's time to get creative with the acrylic paints.

Be warned, you might need to apply the metallic paint in several coats to get a nice finish as some of the cheap craft paints are rather thin.

Rub a bit of black and brown paint over the gun after the initial painting is done to give it a used and dirty look.

Step 5: Seal 'er Up

Tape up the important bits again and give your gun a protective coating.

Step 6: Add the Extra Bits

It's all in the details.

To finish off one of the guns I put together a little cuff to cover where the water storage connects with the rest of the weapon. I just took a scrap of pleather and sewed it into a loop that fit the connector.

I also switched out the original water bottle for the green base of a spray bottle.

For night time water fights, I plan on throwing a little glow stick into the bottle to make it glow (although this will likely make me an easy target).

Step 7: Soak Somebody

Blast away to your heart's content!

Runner Up in the
Krylon Summer Projects Contest



    • Growing Beyond Earth Maker Contest

      Growing Beyond Earth Maker Contest
    • Fandom Contest

      Fandom Contest
    • Backyard Contest

      Backyard Contest

    37 Discussions


    5 years ago on Introduction

    Yes... fool yourselves into thinking you are safe, but when the kraken comes, your foolish weapons will be useless...

    1 reply
    Ian Cognito

    8 years ago on Introduction

    That's not a DiHydrogen Monoxide weapon, it's plainly either an Oxygen DiHydride weapon or a Hydrogen Hydroxide weapon!!!!!

    1 reply

    5 years ago on Introduction

    As an addition to it killing people when inhaled it also causes burns of each degree!!!

    would putting a little bit of dry ice in the bottle increase the blasting range? (but only for those that can be pressurized until you pull the trigger...)

    7 replies

    Absolutely not. Putting dry ice in it will cause it to explode. There are no squirt guns that can contain the pressure. Dry Ice is solid CO2, which has a vapor pressure of 830psi. Plastic soda bottles have been safely tested at around 100psi (depending on the brand) but almost all of them shrapnel by 140psi. DO NOT USE DRY ICE check out the following video at about 2:25 for what happens when you put dry ice in a water bottle: http://dsc.discovery.com/videos/time-warp-dry-ice-bomb.html

    awesome!! what metal could I use that would hold that much pressure? the whole gun would have to be metal. and would it blow me back when I pulled the trigger?

    Look for paintball parts. Because they use CO2 tanks (and some higher pressure compressed air tanks) most of the parts are rated for those kinds of pressures.

    btw if u wanted to diy it ... you could use an old barbeque industrial gas can .. those things can take mad pressure .. my granads back burned and only blew the crappy plasticy top off it .. :) .. they can take a tonn .. i think is up too 1000 .. but dont take my word for it bro ,, im only guessing cuzz there tempered steel bro .. seriously .. dangerous bro .

    Look for parts at McMaster Carr http://www.mcmaster.com/ Any pipe that specifically says 2000psi or higher will work. Remember however, that the system is only as strong as its weakest joint. That means that if you buy 19 of the 20 pieces rated at 2000 psi, but you can only find a valve rated at 150psi, the entire system is only safe to 150psi.

    You might try using a C02 cartridge for a bb gun instead, for a booster. I highly advise against using dry ice. I have seen it blow up metal containers when mixed with water. You could get seriously hurt.


    8 years ago on Introduction

    You fool!! Don't you know that Dihydrogen monoxide is deadly when inhaled?! Hundreds of people die every year from breathing dihydrogen monoxide! lol

    2 replies

    Reply 7 years ago on Introduction

    That's hillarious. Actually, in my science class last year, we had an article going for the banning of Dihydrogen Monoxide that we were supposed to evaluate or something, and more than half the class (granted, we were 7th graders, but still, it was an advanced class) thought that the argument was reasonable! I was one of the select few who got the joke. But, your comment reminded me of that. Here is an abreviated version off wikipedia: "Dihydrogen monoxide:

    is called "hydroxyl acid", the substance is the major component of acid rain.
    contributes to the "greenhouse effect".
    may cause severe burns.
    is fatal if inhaled.
    contributes to the erosion of our natural landscape.
    accelerates corrosion and rusting of many metals.
    may cause electrical failures and decreased effectiveness of automobile brakes.
    has been found in excised tumors of terminal cancer patients.

    Despite the danger, dihydrogen monoxide is often used:

    as an industrial solvent and coolant.
    in nuclear power plants.
    in the production of Styrofoam.
    as a fire retardant.
    in many forms of cruel animal research.
    in the distribution of pesticides. Even after washing, produce remains contaminated by this chemical.
    as an additive in certain "junk-foods" and other food products."

    (Wikipedia, http://en.wikipedia.org/wiki/Dihydrogen_monoxide_hoax). Just search dihydrogen monoxide hoax in google and you'll get the entire hoax, but just to give you the idea, look up! For those of you who don't know what direction "up" is, ^. I even cited it! YAY! All right that seems to me like quite enough typing so, >CONCLUSION!<


    8 years ago on Introduction

    Put in a bit of Pure Dihydrogen Dioxide, and that'll do a number.

    I wouldn't really recommend it, and I won't be responsible for any occurrences if you actually do.

    2 replies