Creating matching copies of existing objects or parts is a professional-level occupation, nevertheless can again be done Homewards by any student. This action is called casting, and consists of pouring a data enjoy plastic, rubber or latex into a mould to harden. In classification to toss, nevertheless, you Testament necessitate to cardinal constitute a mould that is finest suited to the phenomenon you are casting. One of the simplest mould materials is plaster, which is peak suited to copying clay objects. To adjust your own plaster toss mould, succeed the directions in this article.
Instructions
1. Sculpt a example target absent of clay, or choose an existing example intent in another non-porous facts. Provided you are working in clay, coat the sculpture with a shining sealer cognate Krylon Crystal Shiny. Whether you are not working in clay, coat your replica article with a mould Proceeds agent. Let the design dry completely.
2. Acquisition the middle line of your model, all the way around it, that splits your model into two parts.5. Cure the finished side of the mold, then repeat Steps 3 and 4 on the opposite side, applying layers of plaster and burlap until you have matching sides. Let the mold cure completely, then pry the halves apart and remove the modeling clay.
In a bucket, mix up a small batch of plaster by combining gypsum with water. You will want a smooth, creamy texture while working with the plaster mix. Make sure that there are as few bubbles as possible, as these compromise the strength of the mold. Using a paintbrush, apply plaster to one side of the model object, from one end of the modeling clay wall to the other. Let this base coat, or impression coat, cure completely.
4. Paint another layer of plaster mix over the impression coat. While it is still wet, place small strips of burlap over the plaster, covering your model and allowing the burlap to soak up the plaster. Let this layer cure, then apply another layer of plaster mixture over it. Continue adding layers of plaster mix and burlap strips until you have the desired mold thickness. Thicker molds are best for larger objects, as more layers of burlap help strengthen a mold.
Along this line, create a thin wall of modeling clay that separates the two halves of your model. Make the wall a few inches tall, or at least as tall as you are going to make your mold.3. Set your model in a clean, well-protected workspace. You should now have two matching negative forms, which can be strapped together during the casting process.
