Please create a new account to sync your order history.

CopyFlex is GREEN? Yes, and it's now better than ever!

Your cart

How to make a split mold is a request that many of our customers have made through the years. This type of mold is very popular because a split mold offers many of the advantages found in a two part mold, yet it is easier to make and also takes less time. Take a moment to read this step by step tutorial and learn how you can make your own split mold and then benefit from its many advantages.

*Please note that this tutorial was originally made using an earlier version of our CopyFlex® material. The instructions are accurate, but any CopyFlex® you order will be our new, improved clear green formula, not the opaque orange you see in these photos.

Using Safe-D-Clay to Fill Object to be Molded with Silicone Mold Making Materials
Object to be Molded with Liquid Silicone Mold Making Product

Step 1

Before a split mold can be made of this glass candle holder it must be filled with Safe-D-Clay™. Press softened Safe-D-Clay™ to fill the cavity flush with the top. Leaving candle holder empty and filled with air could interfere with the mold making procedure since an air filled object can float when covered with liquid silicone.

Applying Mold-Dit to Bottom of Object to be Molded
Removing Excess Mold-Dit from Mounted Object to be Molded

Step 2

Apply Mold-Dit™ about 1/16” thick to the filled side of candle holder and press this side down onto the work surface so that Mold-Dit™ squishes out along the bottom. Wipe the excess Mold-Dit™ away with a dry brush or soft cloth.

Mold Box Assembled Around an Object to be Molded
Applying a Silicone Skim Coat to an Object to be Molded

Step 3

Mix a small amount of CopyFlex® and apply a “skim coat” with a natural bristle artist brush, working the CopyFlex® into all the details on the surface of the object to be molded. Assemble an Adjust-a-Mold Box around the skim coated object so that a minimum of ¼ inch clearance exists around all sides of the object.

Marking a Fill Line For a Liquid Silicone Mold Making Material

Step 4

Mark a “fill to” line on the inside of the Adjust-a-Mold a minimum of ¼” above the highest point on the object being molded. Pour CopyFlex® to fill line.

Silicone Mold Poured into a Mold Box

Step 5

In order to show this procedure properly, the spring clamps were removed from the Adjust-a-Mold™ in the previous step so that more detail could be captured photographically. In this step, the Adjust-a-Mold™ is shown with the spring clamps attached.

Two Sides of Mold Box Removed from Cured Silicone Mold
Silicone Mold

Step 6

Once the CopyFlex® Liquid Silicone has cured, remove the Adjust-a-Mold™.

Using Knife to Cut an Unmolding Slit in a Silicone Mold
Cutting Unmolding Slit in a Silicone Mold

Step 7

With a very sharp knife, pierce through the top of the rubber mold until the blade makes contact with the object inside. With blade maintaining constant contact with object, cut across top and down corner of CopyFlex® mold to create a slit down one side of the mold.

Unmolding Silicone Slit Mold
Opening Silicone Slit Mold

Step 8

Open mold along the slit to free the object inside.

Assembled Silicone Slit Mold

Step 9

Wash and dry the split mold thoroughly. Use masking tape to secure the mold and keep it closed while in use. CopyFlex® Liquid Silicone cures with memory which means that it will retain the shape it was cured. Masking tape helps keep the mold closed along the slit when in use.