5 Actions On Casting Silicone The Best Way In Easy Steps!

Casting a flat one-piece silicone mold to re-cast the original from the same silicone as the mold itself. The technique of casting silicone in a silicone mold often offers exciting design possibilities. Fascinating is the question; Whether the cast silicone rubber will bond with the mold or not? Let us check out here how to casting silicone the best way!

Casting silicone: Filling and molding – Silicone is considered a multi-purpose weapon. It is due to the many possible applications resulting from its various properties.

The different types of silicone also allow a wide range of applications. In the form of oils and greases, it is practically getting used as a release agent.

It can further be used as a silicone resin and can be getting used as a coating. The application possibilities for the do-it-yourself enthusiast are primarily opened up by silicone rubber.

It is moldable and easy to process and offers many details in the result. The following paragraphs aim to explain the processing and possibilities of silicone rubber.


A related video about “How To Make Silicone Molds For Resin Casting?” here to watch.

Video Credit: Sarah Types


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Properties of the silicone

Properties of the silicone
Casting Silicone – Properties of the silicone / Image by stux from Pixabay

Silicone can stand out from other materials, mostly thanks to some favorable properties. One of these is that there are virtually no allergies to silicone. 

However, appropriate protective clothing can also be getting used, making it possible to work with silicone. Nevertheless, care must be taken in these cases when using it later. 

Silicone is also water-repellent and conducts almost no electricity.


Properties and application possibilities of silicone rubber

Properties and application possibilities of silicone rubber
Casting Silicone – Properties and application possibilities of silicone rubber / Image by Hans Braxmeier from Pixabay

Silicone rubber is the most common use of silicone for the do-it-yourselfer. It is an initially soft mass, which later hardens. 

However, when hardening, the compound remains very smooth and elastic, but loses moisture and can no longer be formed. 

Caution is required, however, because overstretching the dried mixture can lead to fractures and cracks. 

Silicone rubber can nevertheless be getting used for several purposes. On the one hand, with some skills, negative deductions from molds can be used. 

However, molds can also be produced in somewhat more complex work steps and later filled again with silicone.

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Casting silicone – Pouring silicone step by step guide

Pouring silicone step by step guide
Casting silicone – Pouring silicone step by step guide  / Image by estefania17 from Pixabay


From silicone, you can make wonderful and practical shapes. For the molds to achieve the desired appearance, you need to cast the silicone. Read below which tips will help you do this:

  1. Material – The material you need to cast silicone is silicone rubber. The silicone is getting prepared so that it is already in liquid form that it can be poured into molds. Make sure that you buy the rubber in two components. The two parts together make up the finished silicone.
  2. Mixture – The mixture ratios are getting indicated on the packaging, so you should use them as a guide. Make sure to follow the mixing rates as closely as possible; otherwise, you will get a worse quality. Use a kitchen scale to weigh the quantity.
  3. Preparation – Pour silicone into a negative mold, which is the later mold. This mold can be getting made of wood, plaster, or stone. Since the negative form materials are very absorbent, you should treat the surface with a release agent spray beforehand. It prevents the silicone from being absorbed too much into the material of the negative form.
  4. Casting – Your silicone parts should only be getting cast at room temperature or temperatures around 20 degrees Celsius. If it is too hot, the material becomes too liquid; it can clump if it is too cold. Once you have poured the silicone into the mold, let it cure. Depending on the manufacturer’s instructions, this can take up to 24 hours or longer. Tip: Leave the mold in a warm and dry place.
  5. Demoulding – Only remove your silicone mold from the negative mold when it is dry. Otherwise, it may stick to the edges and damage your mold. After 24 hours of drying time, you can make your first attempt. If you cannot remove the silicone easily, then you should wait a little longer.

Info: Start with small and simple forms. Preparing the mold requires a lot of practice and experience. Removing the mold will also be much more comfortable after several attempts.


Making negative molds with original molds

Making negative molds with original molds
Casting silicone – Making negative molds with original molds  / Image by StockSnap from Pixabay

The negative shapes have the simple purpose of being a basis for duplicating particular objects. For this purpose, rubber silicone is excellently suited for use in addition to some other products. 

In some cases, a master mold, i.e., a frame, has to be produced to carry out the molding process. It ensures that the silicone if it is very liquid, cannot spread freely. The original mold should be larger than the object to be getting duplicated. 

It is also essential that the original form is tight and that no silicone can flow under the edges. The silicone is first getting prepared according to the manufacturer’s instructions. 

The liquid silicone is then flooded into the original mold and over the object to be getting duplicated. 

Care must be getting taken to ensure that all areas are sufficiently thick and evenly covered. After curing, the mold can then be getting removed.


Making negative molds without master molds

Making negative molds without master molds
Casting silicone – Making negative molds without master molds / Image by _Alicja_ from Pixabay

It is also possible to duplicate some objects without an original shape. It depends on the consistency of the silicone. 

For example, it is possible to put the silicone in a basin with a mixture of water and detergent. 

Then it can be formed into a large ball. This ball is then getting used to enclose the object. Parts of the silicone can then be getting removed from the thicker areas. 

However, there should be a possibility to get the object out of the mass again. 

For this purpose, either an appropriately large hole is getting needed, or the finished negative form must be cut open. 

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In both cases, the layer should not be too thin not to endanger the stability too much.


Filling molds with silicone

Filling molds with silicone
Casting silicone – Filling molds with silicone / Image by motionstock from Pixabay

Besides the possibility of creating negative shapes, there is also the possibility to fill shapes. First of all, you need a profile to be getting filled. This form can either be produced with silicone or already exist. 

Other materials, such as plaster, can also be used. Usually, silicone does not bond with the hardened silicone. Release agents can still be used to be on the safe side.

The form can then be getting filled with silicone. If it is a closed form, the pouring should be getting done from above. Also, a second hole in the mold is getting recommended to allow air to escape. 

But it is often also helpful to fill two separate halves and connect them later. After sufficient time to dry, the outer form can then be carefully getting removed. A result is then an object made of silicone inside.




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Silicone is a real all-rounder when it comes to producing and filling molds. You don’t need many tools and only a few auxiliaries, but they are easy to make.

Care should always be taken, as impurities can lead to later errors in the duplicated object. Silicone and especially silicone rubber offer the possibility to make and fill molds for duplication.

For this purpose, the compound must be getting produced and used according to the manufacturer’s specifications to achieve the desired result.


Feel free to share this article about “casting silicone” with someone who wants to know more about this topic.

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