Sometimes you want a particular element for a piece you’re working on and you can’t quite find what you’re looking for in the shops. Luckily, if you have an object that’s similar, you can make a mould and use casting resin to make a copy!
Here are my five simple steps, using Siligum moulding paste and EasyCast casting resin.
Siligum comes in two pots – one blue, one white.
On their own, they don’t do anything, but mixed together they will form a flexible compound that you can press things into to form a reusable mould.
Take two lumps from each pot that are the same size.
Mix them by kneading them, and rolling them between your hands for around a minute.
It can be a little tough at first but persevere.
When the ball has become a solid colour, it’s ready to use.
Beware, it sets in five minutes! Don’t hang about at this point.
Press the item you want to make a cast of into the paste. This is a copper blank of a cog, but I also tried taking an impression of a spider ring which really didn’t work as it went straight through the bottom of the mould.
Here is the mould minus the cog blank!
Now you need to mix the resin. Take equal parts resin and hardener and mix with a wooden stirrer – I used a small measuring cup I bought specifically for this purpose, and a cocktail stick. After two minutes of thorough mixing, pour into a second container and mix using a fresh stick.
After a minute, you can add any colourants – I used black mica powder but I’ve also used loose eyeshadow powder too. I added it to the mould by adding droplets from the cocktail stick until the mould was full.
Leave the resin to cure for 72 hours – not good if you’re impatient like me!
Be aware that sometimes bubbles can form – simply run hot air from a hair dryer across the mould until the bubbles rise to the surface and burst.
Some resins and moulding pastes need a release agent to get the cast object free but I found using my products that this wasn’t the case. I simply popped the resin object out of the mould.
Here is my black resin cog close up.
Be careful when you’re casting – ensure that you use the exact same amount of the resin and the hardening agent, and mix thoroughly. Always scrape from the sides of the container and use a second cup to ensure thorough mixing.
Don’t reuse the cups – I bought a supply of about fifty! Same with the sticks. You don’t want to risk contaminating the next batch.