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How to Make a Two-Piece Mold with Silicone Spread™

Objects come in all sizes and shapes and often a two piece mold must be made to properly duplicate an object. This tutorial provides the instructions necessary so that you can learn how to make a two piece mold with Silicone Spread™. It is broken down in steps and accompamied with illustrations in order to give you the confidence to make your own two piece mold and have fun doing it. 

Click the pictures below to enlarge.

Step 1

Step 2

When making a two piece mold of a bottle, it is important to seal the opening so that the Silicone Spread™ does not find its way inside the container. Safe-D- Clay™ is pressed into the opening and leveled flush with the top of bottle. The parting line, which represents where the two parts of the mold will join and separate and usually divides the model into equal halves, is drawn with a marker.

In order to make the first half of a two piece mold, one side of the model in imbedded in Safe-D-Clay™ to the parting line. This is called a clay bed. The remaining exposed side of the model will be the first to receive Silicone Spread™. Notice that the parting line determines the placement of the clay bed which extends outward away from the parting line by at least an inch. This is called a clay flange. Click Here for “How to Make a Clay Bed” Tutorial to see excellent step by step instructions which cover how to make a proper clay bed in detail.

Step 3

Step 4

In this project, the clay flange surrounds only three sides of the model. A retaining wall will be mounted to the fourth side in order to create the opening to the mold. The retaining wall is attached by first applying Anchor-Dit™ to the exposed side of the model and edge of the clay bed. One side of an Adjust-A-Mold™, is pressed against the fourth side flush with the bottom of the model and the clay bed.

Alignment keys ensure that a mold comes together the way it was intended to. When this mold is finished, the alignment keys ensure that the two mold halves will join together perfectly. To make good alignment keys, they should be incorporated onto the clay flange. Four alignment keys in the corners of the clay bed are created by attaching ½” Key-Makers. A little Anchor-Dit™ applied to the bottom of the Key-Maker creates a good bond to the clay and stops the silicone rubber from getting underneath.

Step 5

Step 6

Apply Silicone Spread™ with a firm, natural bristle brush to the top side of the clay bed and the exposed side of the model. (Click Here to Learn Silicone Spread™ Basics) Important: Notice how Silicone Spread™ is also applied onto the retaining wall. This will form a rubber flange around the opening of the mold which is highly recommended. Wait about one hour until Silicone Spread™ is half cured or even longer to a full cure and apply a second, heavier coat with a brush. One layer of Silicone Spread™ will always bond to a previous cured or uncured layer.

Wait about and hour or longer to allow Silicone Spread™ to cure into a more solid layer that will not be disturbed by the addition of another layer. Using a spatula or pallet knife, apply a generous third layer of Silicone Spread™ in order to achieve a minimum thickness of ¼ inch.

Step 7

Step 8

Using more Anchor -Dit™, attach a second retaining wall on the opposite side from the first. The purpose of this second wall will be made clear in the next steps.

Once the Silicone Spread™ has cured (about 2 hours) a wetted pre -measured amount of EZ-Shell Maker™ is applied over the cured rubber and up the sides of both retaining walls. (Click Here to Learn EZ-Shell Maker™ Basics) Applying EZ-Shell Maker™ up the sides of the retaining walls creates a 90 degree bend in the support shell that will serve as a foot on both the top and the bottom of the mold.

Step 9

Step 10

After about thirty minutes the EZ Shell Maker™ becomes quite firm. Remove the retaining walls and turn the whole mold assembly up side down onto the support shell. This gives full access to the clay bed which needs to be removed to expose the second side of the model for mold making. Tip: Applying a thin coat of Release-Dit™ to the model before building the clay bed acts as a parting agent between the model and the clay, making removal much easier.

Remove the Key-Makers and notice the indentations left in the Silicone Spread™. Once the clay bed has been removed along with any remnants of clay on the model, the second side of the model is ready for the application of Silicone Spread™. Before applying, it is critical to apply Release-Dit™ on all three sides of the silicone rubber flange surrounding the model. Silicone Spread™ bonds to itself and the Release-Dit acts as an effective parting agent preventing one side from sticking to another.

Step 11

Step 12

Making side two of this mold is simply a repetition of the steps performed in making side one.

Once the second support shell made from EZ-Shell Maker™ is firm (about 30 minutes), remove the retaining walls and stand the finished mold, open side down. It is real easy to remove the support shells from the Silicone Spread™ and fun to peel the Silicone Spread™ away from the model. Start peeling the silicone by running your finger between the flanges first and slowly peeling each side back and away from the model.

Step 13

The Mold is Ready - You have just learned how to make a two piece mold.  In these pictures you can see the silicone flanges with very nice alignment keys which ensure a good fit.  When this mold is empty and reassembled, it can be clamped tightly creating compression between the two rubber flanges. This gives you an excellent seal and almost eliminates the existence of a seam line on the object being molded. Also notice the opening of the mold and the nice rubber flange that surrounds it. Applying Silicone Spread™ to the retaining wall created this flange which strengthens the mold opening and provides a clean, rubber coating over the plaster foot. Each rubber side fits into its corresponding support shell like a hand in glove while the shape of the support shell enables this two piece mold to be self standing whenever it is being filled or emptied.

When you order Silicone Spread™, you will receive one half as Part A (catalyst) and the other half as Part B (Base). The price of Silicone Spread™ decreases as the quantity ordered increases as indicated below.
Pounds Price per lb. Buy  
1 to 4 lbs. $25.00 per lb.  
5 to 9 lbs. $24.00 per lb.

You Save $1 per lb.

10 to 19 lbs. $23.00 per lb.

You Save $2 per lb.

20 to 29 lbs. $22.00 per lb.

You Save $3 per lb.

30 to 39 lbs. $21.00 per lb.

You Save $4 per lb.

40 to 49 lbs. $20.00 per lb.

You Save $5 per lb.

50lbs. and over

$19.00 per lb.

You Save $6 per lb.

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