this is a paint mine that uses surgical tubing as a propelant to shoot paint up to about 16 feet. it is very cheap and easy to build. there are some mines like these on the market but go for about $50 each. you can make 6 for less than that. heres how!

Step 1: Materials

2feet of 2inch abs pipe (you can make about 6 of them 4inches tall)
12- 2inch abs end caps ( if you want to make 6 mines)
A few feet of 1/4inch surgical tubing (hardware store, need about a foot per mine)
Some thin sheet metal or plastic
1/2inch pvc pipe (only need an inch per mine)
2inch cotter pins and key rings(enough for how many you make)
Epoxy
Wood to make a 1inch tall x1inch wide x1inch long 45degree angle wedge (1 per mine)
Some tent stakes (1 per mine)
Large hose clamps (to go around the 2inch pipe and the tent stake)
Small zip ties
Gasket seal

Step 2: Body

Cut the 2inch pipe to about 4inches.

Step 3: Pressure Tube

Cut a piece of 1/4inch tubing to 12inches. On one end put some gasket seal and tie a knot in the tubing as close to the end as possible. You want the gasket seal to be in the knot. You dont have to do this but i have a hard time with this leaking.

Step 4: Top Cap

Take one of the 2inch end caps and drill a hole whos center 3/4inch from the edge of the cap and a little bigger than the 1/4inch tubing.

Step 5: Trigger

Cut some 1/2inch pvc to 1inch. This is the trigger.

Step 6: Trigger Holder

Take some wood and cut a wedge that is 1inch wide X 1inch tall X 1inch long with the slope at about 45degrees.

Step 7: Trigger Holder Sides

Cut out some holders that mount on the sides of the wedge and that will hold the pvc trigger in place and that also allows for a safety pin to go through the trigger.

Epoxy the wedge and the holders together and let dry!

After the epoxy had set you will want to drill a small hole for a zip tie and the cotter pin in the holders. You will want the zip tie holes to be just above the tubing height. On the holes for the cotter pin, place the trigger between the holders and drill a hole just big enough for the cotter pin through the holders and trigger at the WIDEST PART OF THE TRIGGER. You may also want to drill a hole for the trip wire in the trigger at this point.

Step 8: Glue the Tube Holder to the Top Cap

Take this assembly and the 2inch cap with the hole in it and epoxy the wedge to the cap. You want the wedge about 1/4inch away from the hole. Let the epoxy set.

Step 9: Finnishing

After the epoxy has set put the tubing through the hole with the knot on the inside of the cap and put on the zip ties to hold it in place. You dont want these to pinch the tubing.

Put the hose clamp and the caps on the pipe. Slide the stake in and tighten the hose clamp.

Make sure the knot in the tube is at the bottom of the mine and mark where the tubing is at the cap and cut the end of the tubing so about 5inches are coming out of the mine and your done!

Step 10: How to Use

Fill up the tubing, mine holds about 6oz. You can use a squirt bottle or a pump out of a squirt gun(search for paint grenades on instructables, this was the inspiration).

Fold the tubing up and back and put in the trigger and safety pin.

Find a place to deploy the mine. Stab into the ground with squirting side facing enemy.

Attach tripwire and tie off across from mine. Remove safety pin. The mine is now live and ready to paint!