You can make a mould to cast a bullet using urethane RTV moulding rubber and a few items found at a craft store. Making a mould will allow you to make as many duplicates of a bullet as you wish. Since one-part moulds are used for flat objects, a two-part mould is best for this project.
- Skill level:
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Things you need
- 5 rectangular acrylic pieces
- Glue gun
- Non-hardening clay
- Uncooked rice
- Liquid measuring cup
- Urethane RTV moulding rubber
- Mold-release spray
- 2 pieces of wood (same dimensions as the mould)
- 4 wide rubber bands
Create a container out of rectangular-shaped acrylic pieces. Put the bullet on its side on a flat surface and arrange four acrylic pieces in a rectangular shape around the bullet. Put a fifth acrylic piece underneath the bullet. Make sure the acrylic box fits tightly around the bullet with only about an inch space left around it.
Glue the acrylic pieces together with a hot glue gun. Allow it to dry.
Place non-hardening clay into the bottom of the container and spread it out deeply enough to cover up to the middle of the bullet (after it is pushed into the clay later). Make sure there are no bubbles in the clay.
Push the bullet into the clay. Make sure it does not touch the bottom of the container.
Punch six half-inch deep holes into the clay around the bullet using the eraser end of a pencil.
Pour uncooked rice into the acrylic container until it covers the bullet completely, plus a little extra. Pour the rice out of the mould into a measuring cup. Take note of the number of ounces and then mix this same amount of urethane RTV moulding rubber according to the manufacturer's directions.
Spray the inside of the mould container (clay, acrylic and bullet) with mould-release spray.
Pour the urethane RTV moulding rubber very slowly into the corner of the mould. Allow to dry for 24 hours.
Pry off the bottom acrylic piece with a knife and flip the mould container over. Remove the clay with a knife. Repeat step 7.
Mix the same amount of urethane as before and pour it into the corner of the container, allowing it to dry for 24 hours.
Pry off the sides of the container using a knife. Separate the two parts of the rubber mould and remove the bullet.
Sandwich the rubber mould between two pieces of wood and fasten it together with a few rubber bands.
Pour the casting material of your choice into the mould to replicate the bullet.
Tips and warnings
- Don't pour the rubber onto the object because this could create bubbles that would ruin your mould.
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