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How to Make a Rubber Mold for Plaster？（JCTC HTV rubber）
By Alex Smith, eHow ContributorIf you need multiple copies of an object made out of plaster, you will need to make a mold. Since plaster is a hard material, your mold will need to be flexible in order to peel it off of the copies. The most basic way of doing this is to use rubber molding latex with a plaster bandage shell. Both of these materials can be obtained at any hobby shop.
1
Coat the object to be molded with several thin coats of acrylic enamel spray to ensure that the rubber molding latex does not soak in and bond. Allow each coat to dry before adding the next. This is especially important if your original is made of plaster, foam or other highly porous material.
2
Brush a coat of rubber molding latex onto the surface of the original object, making sure to fill in any nooks and crannies. Latex rubber dries through contact with air, so keep the layer thin. If it is too thick it will form an outer skin, preventing the rubber underneath from drying.
3
Allow the rubber latex to dry. In the meantime, put the brush back into the container of rubber latex and cover it with aluminum foil. Doing this keeps the brush from drying out.
4
Brush on 15 to 20 more thin coats of rubber latex, allowing each to dry before moving on to the next. You can use a hairdryer to speed the drying time.
5
Determine the sort of shell you will need to help the rubber keep its shape. If the object is simple (such as a turtle shell) a one-piece shell will work. If the object is more three-dimensional (such as a sculpted head), you will need to create a two-piece shell.
One-Piece Shell
1
Cut the plaster bandage into short lengths, the specific size determined by the size of your mold. It is best to cut more than you think you will need, so that you don't risk having to stop halfway through when you run out of bandages.
2
Dip a bandage strip into warm water out of a bucket.
3
Squeeze the excess water out of the bandage.
4
Smooth the bandage onto the rubber mold. Make sure there are no gaps or air bubbles, which will cause the rubber to deform when you pour plaster into it.
5
Build up four full layers of bandages over the entire mold surface.
6
Allow the bandages to harden.
7
Pull the original out of the mold.
Two-Piece Shell
1
Select a dividing line for the shell. In the case of a head, for example, the best line is down the center of the head over the ears. Mark the line with a marker.
2
Apply a shell to half of the mold up to the dividing line, following the instructions above. Make the edge by the line a layer or two thicker for added strength.
3
Allow the bandages to dry.
4
Brush a coat of petroleum jelly on the edge of the shell by the dividing line. This will keep one half of the shell from bonding to the other half.
5
Apply the second half of the shell, overlapping the bandages onto the lubricated portion of the first half. Again, make the edge thicker for strength.
6
Allow the bandages to dry.
7
Remove the two halves of the shell from the rubber mold.
8
Peel the rubber off of the original. If needed, cut a seam with a pair of scissors until you can remove it from the original.
9
Reassemble the rubber mold and shell, holding the two pieces together with duct tape.
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