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How to prevent resin from sticking to molds: tips and tricks.

One of the most common problems that can occur when working with this material is that the resin sticks to the molds and makes it difficult to demold the parts.


To avoid this, it is necessary to follow some tips and precautions that I will explain below:

Choose a suitable mold for your project: There are different types of molds for epoxy resin, but not all of them have the same properties and uses. The most recommended are silicone molds, as they are flexible, resistant and non-stick. You can also use plastic, metal or wood molds, as long as they are well sealed and treated to prevent the resin from leaking or sticking.

Use a release agent suitable for your mold: The release agent is a product that is applied on the mold before pouring the resin, to facilitate the removal of the piece once the resin has cured. There are different types of release agents, such as waxes, oils, aerosols or liquids, which should be chosen according to the mold material and the resin to be used. It is important to follow the manufacturer's instructions and apply the release agent evenly and without excess, to avoid affecting the finish of the part.

Pour the resin carefully and slowly: Resin is a viscous, fluid material, which can drip or run if applied too quickly or too much. Use a brush, spatula or syringe to pour the resin gently and accurately, covering the entire surface of the mold evenly. Avoid creating air bubbles when pouring the resin, and if they form, remove them with a blowtorch, hair dryer or toothpick.

Let the resin cure in a suitable place: Once you have poured the resin, you should let it dry and harden in a safe, clean and ventilated place. Avoid direct exposure to direct sunlight, extreme heat or cold, as these can affect the curing process. Also avoid contact with water, dust, hair or insects, which can ruin the surface of the resin. Curing time depends on the type and amount of resin you have used, but generally ranges from 24 to 72 hours.

Carefully and patiently unmold the piece: Once the resin is completely cured, carefully and patiently unmold the piece, trying to gradually remove the piece from the mold. Do not use sharp or cutting objects to demold, as they can damage the part or the mold. If the piece resists to come out, you can apply a little heat with a hair dryer or immerse the mold in hot water, to soften the resin and facilitate the unmolding.

Some examples of release agents are:

Carnauba wax: It is a natural wax that is applied with a cloth or sponge on the mold, and allowed to dry. It can be used for plastic, metal or wood molds.

Silicone oil: It is a synthetic oil that is applied with a brush, syringe or sprayer on the mold and let it dry. It can be used for silicone or plastic molds.

Mold release spray: This is a spray product that is applied on the mold and allowed to dry. It can be used for any type of mold.

Release agent liquid: It is a liquid product that is applied with a brush, a syringe or a sprayer on the mold and let it dry. It can be used for any type of mold.

Here are some tips to prevent the resin from sticking to the molds. By following these steps, you will be able to create and unmold your art pieces easily and safely.

We hope you liked this article and that you are encouraged to experiment with this versatile and creative material. See you next time!


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