Step ? 1:



Cover your work surface with an old newspaper or a vinyl peace. As you may see from this photo plaster casting is a bit messy, so it is essential to protect your countertops.

Step ? 2:

Check the mould to ensure it is clean and dry. Any dirt might show on the finished casting.

Step ? 3:

Many moulds cannot sit flat on the counter, therefore, it is important to give them support while using. The most simple process is a zip lock bag filled with a few pounds of rice. Rice bags are convenient to pack and store when not being used and are made of common materials most people find handy. A box of sand will also work well but it is more difficult to store it when not being used.

Step ? 4:

The surface tension of the water tends to trap air leading to pinholes in the finished casting. Airid is a product meant to break that surface tension, reducing the chances of trapped air. Spray or wipe a thin coat of Airid into the mould.

Step ? 5:

Wiggle the mould down onto your rice/sand bag till it looks level. You are now ready to mix plaster.

Step ? 6:

To find out how much plaster will it hold fill the mould with water. It is the exact amount of water you will need. Add a bit more and weigh it on scale.

Step ? 7:

Plaster should always be added to water and never vice versa. Sprinkle it in slowly to allow it to absorb water.

Step ? 8:

Let the mixture remain undisturbed for 2 minutes so the plaster absorbs all water.

Step ? 9:

For coloring, pigments should be added now.

Step ? 10:

Utilize a potato masher to mix thoroughly for about a minute. Small amounts can be mixed with a stick.

Step ? 11:

Pour the plaster in a corner of mould and let it flow across the complete mould. On deeper moulds, pour it down the side of corner to avoid entrapped air.

Step ? 12:

Once the mould is poured, wiggle it to dislodge any air which may have remained in the mould.

Step ? 13:

Periodically feel the mould. When the mould is warm to touch, the plaster casting may be removed.

Step ? 14:

Gently flex the edges of mould to break sides of casting loose.

Step ? 15:

Hold the mould just above the rice/sand bag. Use pressure gently to take out the casting.

Step ? 16:

After casting is out, set the mould to be cleaned.

Step ? 17:

Utilize a knife to cut the sharp edges off the back of the casting. For fast drying it should be put where it gets air from all angles.

Step ? 18:

When fully hardened, most of the plaster will flake off or breakout the plaster.

Step ? 19:

Flex the blade of the plaster blender to flake the dried plaster off.

Step ? 20:

Wipe off tools and moulds for final cleaning up.

Step ? 21:

If you utilize a rice bag any drips may be removed by flexing the bag. For sand box, just pick out any plaster that has fallen on sand.

Step ? 22:

Pack up your moulds, tools and plaster. Throw away the old newspaper with which you had covered the working area. If you had used vinyl piece, dust it and wipe with wet cloth.