After seeing this article on Hackaday describing an easy to make silicone casting material I knew I had to give it a quick go. The photos here show the results of making a mold of a polymer clay heart and then making a heart shaped ice cube from it.
Oogoo is basically equal parts corn flour and sealant, mixed into a white goo. This Instructable has all the details for making Oogoo and fully documents its many uses.
Mixing Oogoo takes a bit of effort, I used a cardboard tub as a container and an old paintbrush handle to mix with, this probably made it more difficult than it needed to be but that’s what I had to hand.
Once mixed, i found it quite difficult to spread over my heart form, next time i plan to wear latex gloves and shape it by hand.
Even with my shoddy mixing, crappy tools and less than ideal spreading technique, I ended up with a usable mold in around 2- 3 hours. To test it out, I simply filled it with water and froze it for an hour or two.
As you can see, the Ice heart isn’t perfect, but it’s pretty close. A definite success!
In future, if I need to make a mold for any reason, Oogoo is going to be my first port of call, its quick, cheap and absolutely stinks of vinegar. What more could you want?