Dihydrogen Monoxide Projectile Weapons





Introduction: Dihydrogen Monoxide Projectile Weapons

Krylon Summer Projects Contest

Runner Up in the
Krylon Summer Projects Contest

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!



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

    dark and twisted dude wow and you are good at it

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

    All of those names are valid in the scientific field, including water, and in solid form, ice

    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...)

    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 .