A Practical Guide on How to Make DIY Silicone Molds

DIY silicone molds for concrete can be a cost-effective way to unleash your creativity. This guide explores all you need to know about silicone molds, from materials & methods to applications & care.

What is a Silicone Mold?

A silicone mold is a rubber tool for replicating objects or creating custom shapes. The molds are highly flexible and durable, allowing you to capture intricate design details. They are typical in various DIY projects, crafts, baking, and industrial applications.

The production cost varies based on several factors. For instance, different grades, such as food-grade, medical-grade, or industrial-grade silicone, come at varying prices. The silicone rubber choice impacts the overall production cost.

The size and complexity of the mold can also impact the cost. Larger or more intricate molds require more silicone material, increasing costs. Additionally, the silicone walls’ thickness influences material consumption.

However, producing molds in bulk can reduce costs. Making molds in large quantities spreads expenses across multiple units, making each mold more cost-effective.

In general, custom silicone molds are durable and suit regular applications, making them an ideal choice for various creative and manufacturing projects.

DIY Silicone Mold-Making Material


The two-part platinum silicone kit can be an excellent DIY mold-making material. It suits both non-food and food products. Thus, it is convenient for minor and complex DIY molding projects. 

It is non-toxic and odorless to suit diverse industries. Curing the two-part platinum silicone renders it food-safe, a crucial factor for consumer products’ molds. Hence, it may suit critical applications like crafting culinary items. 

In any case, the mold material creates smooth and strong molds that can stretch with immense flexibility to avoid tears. The flexibility makes it a perfect mold material for demolding objects with intricate shapes and fine details. 

Meanwhile, it allows fast curing and eases use. These features speed up molding, enabling DIY artists to mold efficiently. The fast-curing nature allows them to complete projects quickly.

The two-part platinum silicone has a thin viscosity, rendering it an ideal material for producing objects with fine surface details. In other words, it suits projects for precisely capturing intricate shapes, textures, and patterns requiring excellent release properties. 

It creates reusable molds, ensuring longevity and low cost since properly cured mold will produce hundreds of castings without wear and tear. The material is also pure, with no by-products or fillers. It complies with FDA’s standards, implying that it is free of BPA or VOCs (volatile organic compounds).

DIY Silicone Molding Methods

  • Silicone and Liquid Soap Method

The silicone and liquid soap method is concise in creating silicone molds. You will need a container to serve as the mold box. This method involves mixing 100% silicone caulk with liquid soap in a 1:1 ratio. The liquid soap is a release agent for curing the silicone.


It involves spreading the mixture evenly over the object you want to mold, eliminating air bubbles. Hence, you will allow it to cure for the recommended time. Once cured, the resulting silicone mold becomes flexible, and you can easily remove it from the object. This method is ideal for simple shapes and projects where flexibility is necessary.

  • Silicone and Cornstarch Method

The silicone and cornstarch method is another excellent DIY option for creating silicone molds. Like the previous method, it requires a mold box to hold the material. You will mix 100% silicone caulk with cornstarch in a 1:1 ratio.


Cornstarch helps thicken the silicone and reduce its stickiness. Next, apply the mixture over the object you wish to mold, ensuring it covers the surface evenly. Again, eliminating air bubbles is crucial for a smooth mold in this method. 

You must allow the silicone to cure fully. Once cured, you can remove the resulting mold from the object. In general, the silicone and cornstarch method is suitable for basic shapes and low-detail molds.

  • 2-Part Silicone Method

The 2-part silicone method is a more advanced approach that allows for greater detail and versatility in DIY mold-making. This method involves using a two-part silicone rubber compound that consists of a base and a catalyst. 


You must correctly measure and mix the components according to the manufacturer’s instructions. Start by choosing and cleaning the object you want to mold. You can prepare the silicone by mixing the base and catalyst thoroughly but gently. 

The goal is to avoid introducing air bubbles. You will catalyze the silicone by adding the catalyst to the base and mixing it. Creating a mold box around the object to contain the silicone is crucial. Next, carefully pour the mixed silicone compound over the object.

You must seal the mold box to prevent leaks. Allow it to cure for the time the manufacturer recommends, typically several hours. Once fully cured, you can carefully remove the mold from the object for a quality silicone mold with intricate details. 

This method suits complex shapes and projects where precision is essential, making it a preferred choice for many DIY enthusiasts and artisans.

How to Make Custom Silicone Mold on DIY

  • Choosing the Object

Creating a custom silicone mold begins with selecting the object to replicate. Choose an object that captures your interest and suits your project’s purpose, whether it is a delicate piece of jewelry, a unique figurine, or a prototype part. 

Before proceeding, clean and free it from contaminants like dust, dirt, or residue from previous materials. Cleaning is crucial because any impurities on the object’s surface can compromise the quality and detail of the final mold. Use a cleaning solution to wash the surface, and let it dry before the next steps.

  • Preparing the Silicone Material

Different silicone rubbers may have varying properties, such as curing times and hardness levels. Always adhere to the manufacturer’s instructions and safety precautions provided with the silicone material.

Most silicone rubbers come in Part A and Part B. You must properly measure equal parts of these components to ensure an accurate 1:1 ratio. Using clean, disposable containers for mixing helps to prevent contamination. Thus, a mixing stick or spatula will help you combine Part A and Part B appropriately.

  • Mixing

Achieving a homogenous mixture is crucial for creating a high-quality silicone mold. After measuring and placing the equal parts of Part A and Part B in a clean container, thoroughly mix them. 

Ensure there are no streaks, swirls, or variations in color. Incomplete mixing can lead to an imperfect mold that might not capture fine details accurately.

  • Catalyzing the Silicone

Silicone rubber requires a catalyst to initiate the curing or hardening process. The catalyst typically comes with the silicone rubber kit and is essential for transforming the liquid mixture into a solid mold. 

Precisely measure and add the catalyst according to the manufacturer’s instructions. Pay careful attention to the recommended ratios and ensure accurate measurements.

You must use the correct catalyst ratio since an incorrect proportion will affect the final mold’s curing time and quality. Next, gently mix it into the silicone rubber mixture.

  • Creating a Mold Box

To contain the liquid silicone rubber and shape it into a mold, you must construct a mold box surrounding your object. The silicone mold box must be slightly larger than the object to accommodate the silicone.

You can construct mold boxes from various materials, including wood, plastic, or cardboard. Ensure that your mold box is sturdy and completely watertight. In any case, proper sealing is essential to prevent. 

  • Pouring the Silicone Rubber

With the mold box in place, position the cleaned object inside, ensuring it rests at the desired depth. Pour the mixed silicone rubber mixture slowly and evenly over the object. Start pouring from a corner or edge to allow air bubbles to escape for a smooth surface.

Continue pouring the silicone rubber until you fully submerge the object. To eliminate trapped air bubbles, gently tap the mold box on a table or countertop. This step helps ensure that the silicone surface captures all the details accurately.

  • Ensure It Is Water Tight

To prevent any leaks during the curing process, ensure the mold box is tightly sealed and completely watertight. You can use clamps, rubber bands, or tape to secure all edges and seams, leaving no room for the liquid silicone rubber to escape. Scrutinize the mold box to identify and seal any potential gaps or openings.

  • Wait for It to Cure & Remove the Mold

Allow the silicone to cure and harden following the manufacturer’s recommended curing time, typically about 24 hours. Ensure the mold box remains undisturbed during this period, allowing the silicone to set appropriately.

After the silicone has fully cured, it’s time to unveil your custom mold. Carefully remove any securing mechanisms and gently flex the mold box to release the object. Slowly peel back the silicone rubber to reveal your custom mold.

Making Silicone Molds With or Without a Template

When creating silicone molds with a template, the goal is to produce a duplicate of the original object. To do this, you’ll need a frame to contain the silicone. Therefore, the object’s frame can help avoid spreading the silicone uncontrollably. 

When constructing the frame, base its dimensions on the object to replicate. This approach conserves molding material, which can be relatively expensive. Your homemade frame must be airtight to prevent the silicone from seeping into any potential cracks or edges. 

Alternatively, you can utilize empty packaging as a container for pouring the resin. With the frame ready, place the original object inside and prepare the mixture according to the manufacturer’s instructions. 

Spread the silicone mixture evenly within the frame, ensuring complete object coverage. You must allow the silicone to harden. Once cured, you can easily remove the mold from the object. This method suits applications where you aim to replicate objects precisely with the original shape and details.

To create a silicone mold without a template, you must make it formable by mixing it with water & detergent. Hence, you can submerge the object in the silicone mixture. Adequate silicone amount is critical for strength and stability. 

When using this approach, remember the silicone mold must feature an opening at one end to allow object removal. Meanwhile, you can cut the mold at one point after it fully hardens. The approach suits molds without access to the original object’s template. 

DIY One-Piece vs. Two-Piece Silicone Molds

When embarking on your mold-making journey, you must pick between a one-piece or two-piece silicone mold. Each option offers distinct advantages and considerations, depending on the nature of your project.

Think of one-piece silicone molds as akin to ice cube trays. These molds are simple and efficient to use. You fill the mold with your chosen material, allow it to set, and then de-mold the finished product. 

However, it is essential to note that one-piece molds create objects with flat surfaces. If your design does not have a flat side or if it features deep undercuts and intricate details, removing the master and finished parts can be challenging.

Nevertheless, one-piece silicone molds suit designs that do have flat sides and lack complex undercuts. They are ideal for creating seamless 3D reproductions of the master object.

On the other hand, two-piece silicone molds suit replicating 3D masters that lack flat sides or feature deep undercuts. These molds consist of two pieces that join together to form a fillable 3D cavity, resembling the concept of injection molding.


Two-piece molds eliminate the presence of flat surfaces on the finished parts, ensuring that even complex shapes and designs are accurate. While they provide this versatility, they require a slightly more complex creation process. 

The two mold pieces must fit perfectly flush since seams may form on the final product. For resin casting, in particular, two-piece molds are highly suitable. They create three-dimensional objects.

Model builders also find two-piece molds valuable for producing diverse objects. These molds facilitate the combination of parts of different sizes and materials seamlessly. The two-piece silicone mold-making process involves modeling clay to fill half of the frame, smoothing the surface, and creating well-defined corners. 

You can remove the clay and initial silicone mold after curing. Applying a Vaseline layer before pouring the liquid silicone into the frame ensures you separate the mold halves effectively. The second silicone layer must also cure properly.

Working with Epoxy Resin for Silicone Molds

Working with epoxy resin opens up a world of creative possibilities. Epoxy resin and corresponding hardeners form the foundation for crafting various objects, from decorative pieces to functional items. 

The process involves mixing resin and hardener in precise proportions, often adding color pigments for customization. Polished silicone molds frequently play a role in epoxy resin casting, facilitating glossy, well-defined shapes.

The object’s range using epoxy resin is virtually limitless. You can create cubes, balls, pyramids, stars, hearts, flowers, coasters, and intricate figures. You can pour the epoxy resin mixture into the mold to shape your project. 

It can feature clear or colored pigments, allowing you to add embellishments like glitter, stones, shells, or flowers. After fully curing the resin, you can carefully de-mold it to reveal a unique form. 

Yet, selecting the appropriate epoxy resin formulation is paramount to achieving the desired results. Opt for epoxy resins that specifically suit casting applications. These resins can cure transparently, exhibit minimal shrinkage, and release quickly from molds. 

You can choose low-viscosity epoxy resins since they can flow into intricate details and capture fine textures. To identify the best epoxy resin for your project, consider researching different that align with your specific requirements.

You can measure the silicone hardness on the Shore-A scale. Softer silicone molds have lower Shore-A values, providing high flexibility but reduced stability. Meanwhile, harder molds have higher Shore-A values, offering more resilience but less elasticity.

Softer silicone molds are advantageous for easy de-molding but may deform quickly due to their low hardness degree. In contrast, molds with higher Shore values are more challenging to de-mold but virtually eliminate deformation.

In any case, silicone molds with undercuts are tough to de-mold. Undercuts are areas where corners and edges protrude and can obstruct the removal process. You can manage small undercuts with Shore values ranging from 0 to 20. 

However, you require a more strategic approach for larger undercuts. In such cases, creating a two-piece or multi-piece mold is advisable. Flexible, soft silicone rubber is apt, but extra care can help you avoid overstretching the mold.

If standard de-molding methods are not feasible, cutting the silicone mold at one edge and then resealing it with tight rubbers can provide an effective solution. This approach simplifies the cast part removal.

Typical Applications for Silicone Molds

Due to their user-friendly nature, silicone molds have widespread utility across various industries and creative pursuits. Here are some typical applications where silicone molds play a pivotal role:

  • Prototyping

Silicone molding is a valuable tool in prototyping and product development within numerous industries. They are more cost-effective than traditional complex tooling, such as injection molding, making them an ideal choice for prototyping product designs. 


Thus, they suit producing beta units for market testing. While 3D printing is well-suited for rapidly creating one-off parts, silicone molding excels in smaller production runs.

  • Jewelry

Jewelers harness silicone molds to replicate hand-carved or 3D printer patterns in wax. This innovation streamlines the jewelry-making process by eliminating the time-consuming task of crafting wax-carved designs for each new piece. 

Silicone molds are adept at capturing intricate details, enabling jewelers to craft pieces with ornate designs and complex geometries.

  • Consumer Goods

Silicone molds are a go-to choice for creators crafting custom consumer goods, such as soaps and candles. They are also prevalent in school supply manufacturing, where they shape items like chalk and erasers. 

The collectible industry leverages silicone molding for high-quality miniatures and custom figurines. Innovative processes like SOPCAST combine 3D printing, silicone molding, and injection molding.

  • Food & Beverage

Food-grade silicone molds are indispensable in the creation of whimsical confections. Chocolatiers use silicone molds to fashion intricate chocolates, while ice pop and lollipop makers rely on them to craft delightful treats. 

The heat-resistant properties of silicone, withstanding temperatures up to 400°C, make it suitable for culinary applications. It suits baking muffins and cupcakes that rise beautifully in silicone molds.

  • DIY Projects


Independent artists and DIY enthusiasts often use silicone molding to craft unique creations. Silicone molds offer the flexibility to shape or replicate a wide range of items, from bath bombs to dog treats. 

The possibilities for DIY projects using silicone molds are nearly limitless. One exciting project involves creating casts. Thus, silicone molds are indispensable tools for professionals and hobbyists in creative visions across various domains.

Advantages of Using Silicone Molds

Silicone molds have gained immense popularity in recent years, and their usage spans various creative projects. These molds offer several advantages that make them a favored choice for crafting. Here are some key silicone molds advantages:

  • Non-Stick Surfaces

Unlike traditional plastic molds, silicone molds ensure your creations effortlessly pop out without tearing or sticking. This non-stick property simplifies de-molding and ensures your products maintain their intended shapes and details. 

Moreover, it facilitates easy cleaning. A quick rinse with warm water or a trip through the dishwasher results in a hassle-free cleanup, saving valuable time.

  • Temperature Resistance

Silicone molds exhibit impressive temperature resistance, withstanding -40 to +250 degrees Celsius. This remarkable tolerance to hot and cold conditions makes it ideal for diverse applications.

Whether baking delectable treats, crafting candles, or making soap, silicone molds remain structurally stable and perform consistently. This feature ensures quality creations regardless of temperature fluctuations.

  • Durability of Silicone Molds

Silicone molds are renowned for their durability. They can endure the rigors of repeated use, maintaining their structural integrity over time. This durability means that molds can handle the demands of various projects. 

Their robust nature extends their lifespan, ultimately saving you money on replacements. Thus, silicone molds are cost-effective for long-term crafting endeavors.

  • Flexibility of Silicone Molds

Silicone molds have numerous shapes and sizes, showcasing their remarkable flexibility. This versatility suits various projects. Whether intricate designs or straightforward shapes, silicone molds can adapt to your needs.

Care of Silicone Molds

Silicone molds can serve you well for a long span, ranging from 10 to 20 years, even with regular use. Here’s how you can ensure silicone mold durability:

  • Preventing Cross Contamination

To maintain safety standards, you must designate silicone molds for specific purposes. These functions include food-related projects or non-food uses such as science experiments or crafts. 

While regular cleaning is essential, designating molds helps prevent cross-contamination that may occur due to residual materials.

  • Cleaning Silicone

You can use hot water and grease-cutting dish soap to clean silicone molds. Hand wash and dry the molds for several hours before storing them to guarantee complete dryness. Avoid using abrasive cleaners or sponges since they can damage the surface.

For stubborn stains, consider using a paste made of baking soda. You can apply it over the affected areas and allow it to dry overnight before rinsing in the morning. While dishwasher use is possible, it may result in a soapy residue.

  • Protecting Molds from Damage

You must limit oil use since they can lead to silicone deterioration over time. Furthermore, avoid exposing the molds to direct sunlight, as UV rays can also contribute to degradation. 

While silicone molds are generally robust for their intended purposes, accidents can occur. If you damage a mold, you can repair it with silicone rubber adhesive. Ensure you clean all edges with acetone on the bonding surfaces before applying the sealant.

  • Storage of Silicone Molds

Keep the silicone molds flat for optimum storage. Stacking molds in a drawer or cupboard can result in damage. However, if you use molds extensively for professional purposes, store them flat to prevent potential warping.


Silicone molds may exhibit varying softness, stiffness, depth, and detail. These characteristics make certain molds better suited for specific projects. For instance, molds with minimal detail and softness are ideal for bath bomb making. 

Meanwhile, molds with intricate detailing and stiffness work well for soap making. Experiments will help you identify which molds suit your applications, allowing you to attain proficient results.


You can embark on creative ventures like resin casting, soap making, and more by carefully choosing, cleaning, mixing, and catalyzing silicone molds. Remember to prioritize safety and follow apt manufacturer instructions. 

To access quality silicone products for your mold-making projects, consider visiting Legenday. With their expertise and premium materials, your creative possibilities are limitless. Buy DIY silicone molds from Legenday and let your imagination flourish!

Frequently Asked Questions

  • How Long Do Homemade Silicone Molds Last?

With proper care, homemade silicone molds last ten to 20 years of regular use. But proper cleaning, storage, and protection from UV exposure are critical factors in extending the lifespan.

  • Does Silicone Not Stick To Any Material?

Silicone is not adhesive to certain materials, including most plastics, glass, and metals. This non-stick property makes it a popular option for bakeware, as it easily releases food items without sticking to the surface.

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