About Resin

• The resin used for casting insects is in fact a plastic synthetic that is mixed with a hardening agent to create a clear, preserved insect cast. Synthetic resins were developed to mimic natural tree resins, which are sticky, clear substances commonly produced by coniferous trees that harden when dry. Synthetic resins are also made of polyester or acrylics, though plastic resin is most frequently used for casting insects. Insects encased in synthetic resins can be made at home using materials purchased from hobby stores and are also commercially manufactured and sold at collectible stores.

Process

• The process of embedding insects in resin is called casting. Resin is mixed with a liquid hardener, or catalyst then poured into a plastic mold that can be many different shapes and sizes. The insect specimen is then placed into the mold and the resin is allowed to dry for at least 48 hours. Once the resin is dry, the edges are sanded using 200- to 600-grit sandpaper. The insect can also be encased in resin using layering. A primary layer fills the mold halfway and then the insect is placed in the resin. Air bubbles are removed from the resin, and then once the primary layer dries to a sticky coat, a secondary layer is poured over it to fully encapsulate the insect.
  
  

  
  

• Any insect can be encased in resin using the casting process, however, certain insects require preparation before they are encased to guarantee a good-looking resin cast. Butterflies have to be spread very carefully along with all other insects because after being dried their appendages become brittle. Silvering is what happens to an insect when it is cast before it is dried. The bodily water content of the insect begins to evaporate and the abdomen begins to shrivel away from the mold that has been cast. This is especially common in larger insect casts, such as grasshoppers, moths and large  spiders. To prevent this, most large insects are soaked for several days in denatured ethanol, then laid on a paper towel to soak out the remainding moisture which dries the insect out before casting. Casting insects is just like any other embedment, you just need the right size mould and patience. If the insect is completely dry it may be to dry, there is a chemical that can be purchased that loosens up an insects apendages for easier play.

Uses

• Once the insect has been cast in resin, it can be used for many different things. Sometimes resin casting is simply used to preserve interesting insect specimens. Additionally, insects cast in resin have been used as paperweights  and collectible toys. The resin-cast insect can also be attached to jewelry fixtures and made into necklaces,  bracelets and earrings.