I am trying to replicate a clip on a part of mine, as per my other thread (after thinking about it, the thread was unnecessary). I have tried making the mould using clay and plasticine to make an impression, both worked ok the clay was perhaps a bit easier but not as nice. However, I then cast the pieces using this casting resin and a tiny amount of black epoxy pigment. After leaving them to cure for 24 hours, I tried to demould but discovered the cast pieces are very flexible, ie. I can bend the clip in half, twist it around, etc. very easily with no visible damage. 5 days later, this is still the same. There is no tack to the pieces, they feel fully cured.