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Top 3 mistakes with epoxy resin silicone molds

Why does resin stick to a silicone mold?


Actually, resin shouldn't stick to silica molds! When it does happen, it's usually not without reason!

Resin can stick to silicone molds if there are irregularities or small scratches on the silicone surface. Most of the time, however, the maximum temperature was exceeded because an attempt was made to remove bubbles in the resin using a lighter or Bunsen burner.

To avoid resin sticking to silicone molds, you can follow these tips:

  1. Use a release agent on the silicone mold before adding resin. There are special resin release agents that form a release layer on the surface of the silicone mold and prevent resin from sticking.

  2. Make sure the silicone mold is clean and dry before adding resin. Residual moisture or dust particles can cause the resin to stick to the silicone mold.

  3. Use a silicone mold with a smooth surface and no irregularities or scratches. A smooth surface makes it easier to remove the resin from the mold.

  4. Carefully remove the resin from the silicone mold after it has completely hardened. Do not pull on the mold too hard as this may cause damage and the resin may further damage the mold with further castings.

  5. Use high quality silicone molds. Thick shapes dissipate heat better and are generally less sensitive to heat.

Why does my silicone mold become dull over time?


A silicone mold can become dull after repeated use with epoxy resin because the resin slowly stresses the silicone surface through a chemical reaction, causing it to wear away and leave a dull, rough texture.

In addition, other factors such as improper cleaning or excessive use of release agents can cause this. If the mold is not cleaned properly, residue from epoxy resin may remain in the mold, dulling the mold over time.

To prevent a silicone mold from becoming dull after repeated use with epoxy resin, you can follow these tips:

  1. Use a sufficient amount of release agent on the silicone mold before adding epoxy resin to prevent excessive adhesion of the resin to the mold. We recommend use from the 6th use onwards.

  2. Clean the silicone mold thoroughly if necessary to ensure that no epoxy residue remains in the mold. Under no circumstances should you use sharp objects for cleaning and never wipe the mold! Please follow our cleaning recommendation: care for and clean the silicone mold and cup

  3. Avoid excessive use of epoxy resin: only use resin systems that have been developed for the required thickness of the mold! For example, do not use jewelry resin up to 2cm in a 5cm thick table mold.

  4. Use a high quality silicone mold suitable for use with epoxy resin to ensure longer life and a smoother surface. Please take a look at our silicone mold shop.

  5. Be careful when removing resin from the silicone mold to avoid damage to the mold and ensure a longer lifespan.

Why do my silicone molds bend or bulge?


Silicone molds can also bend after repeated use with epoxy resin because the resin produces heat as it cures, which can cause the molds to deform. Epoxies are known for their thermal stability and can generate a significant amount of heat at the curing temperature. This heat can also be generated by using heat such as lighters, Bunsen burners or hot air dryers.

If you use silicone molds that are not designed for use with epoxy resin, they may become deformed due to the heat generated during the curing process. This can cause the molds to warp, bend or even crack.

To prevent your silicone molds from bending after repeated use with epoxy resin, you can follow these tips:

  1. Use silicone molds specifically designed for use with epoxy resin. These shapes tend to be more heat resistant and more resistant to deformation and bending. Cheap, very thin-walled molds quickly break! Visit our silicone mold shop . We have over 600 silicone molds for you, handcrafted perfectly for use with epoxy resin and UV resin!

  2. Use a sufficient amount of release agent on the silicone mold before adding epoxy resin to prevent excessive adhesion of the resin to the mold. We recommend use from the 6th use onwards.

  3. Allow the epoxy to cure completely before removing the molds. If the resin is still soft or sticky, it may cause the molds to warp or bend.

  4. Avoid bending or deforming the molds when they are still warm or hot. Allow them to cool to room temperature first before removing or cleaning them.


Image: Natascha Weixler


Extra:

Why does my UV resin stay sticky?

This blog post is about silicone molds and not really about the resin. However, there is an exception!

UV resin

UV resin may only be used in translucent or transparent forms such as: Molds can be cast from our shop . Since UV light must reach the resin for curing, a translucent form must be used when using UV resin.


By following these tips, you can ensure that your silicone molds last longer.





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See you next time,

your Dominik from Chooseyours11 your Resin Art Shop!

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