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Two part and 3D molds require multiple molds be to be made, one at a time, over sections of an object. In order to accomplish this task, portions of an object are buried in a clay bed made from Safe-D-Clay. This tutorial covers the process by providing pictorial, step by step instruction that demystifies this common mold making practice.
Establishing a Parting Line on an Object for a Two Part Mold

Step 1

A parting line represents where on a model the two halves of the mold will separate and come together. The parting line in this example runs directly down the middle of our model and a marker is used to visually identify its position. Remember that the parting line should be placed in such a manner that each half of the mold can be removed without exerting a destructive influence on the object being unmolded and the mold avoids entrapment by an undercut.

Sealing an Object to be Molded with Mold-Dit

Step 2

Apply a light yet thorough coat of Mold-Dit™ to the side of the model that will be imbedded in clay. The Mold-Dit™ acts as a parting agent so that the clay can be more easily removed when it comes time to make the second side of the two part mold.

Leveling Master on Safe-D-Clay for Mold Making
Leveling an Object on Safe-D-Clay - Preparation for Mold Making

Step 3

Place model on a pad of Safe-D-Clay™ so that the Mold-Dit™ covered side is facing down and the other side as defined by the parting line is level and facing up. Use a Chef’s Level to make sure the model is level.

Cutting Safe-D-Clay with a Knife
Mounting an Object onto Safe-D-Clay

Step 4

Every pound of Safe-D-Clay™ comes in three rectangular segments. Cut down the length of the Safe-D-Clay™ segment aligning the knife so that a diagonal cut (corner to corner) is made in order to produce two clay wedges. Place the wedges as shown in photo in order to stabilize the model and keep it in place as the clay bed is being constructed.

Building a Clay Bed around an Object for Mold Making

Step 5

Using more Safe-D-Clay™segments, cut and place Safe-D-Clay™ in order to create a flange around the model at least 1 inch wide. Important: Safe-D-Clay™ should be stacked so that it is exactly even with the parting line.

Object Imbedded Properly in a Clay Bed
Clay Bed for a Two Part Silicone Mold

Step 6

Once the Safe-D-Clay™ has been stacked and puzzle-pieced together to form the general shape and proportions of the clay bed, rub out the seams in order to create a smooth surfaced bed of clay surrounding the model. This can be done by hand or by using clay working tools. Important: The clay bed should be pressed and smoothed against the model at the parting line. There should be no air gaps of any kind between the model and the clay bed where the clay flange and the model meet.