Whether you are making resin-cast items, clay or any type of mould-cast item, you need a mould release agent. Casting materials start as mixed liquids take the form of the shape of the mould they are poured into. The casting materials can become stuck in the mould, which can destroy the mould and likely the moulded object as well. A mould release agent is important to eliminate sticking and make a successful casting. You can create your own release agent with oil.
Pour 1/2 cup of mineral oil into a spray bottle.
Add 6 drops of bleach to the spray bottle and replace the lid. The bleach will prevent mildew from forming on your mould and ruining it.
Shake the spray bottle each time before spraying the release agent onto your mould.