A computer chip would be really cool to cast in! Not to mention a lot easier than a bug. Hazel, I would fill in half the mold, place the bug in, fill up the rest with more resin and then close the mold. This is the only way I can think of doing it to make sure there aren't any air bubbles.
Here's an update on my keys. The clear ones I've created as well as the sparkly sky blue one have cured quite nice. I'm 90% satisfied with their finish. They feel much harder and stiffer than a few days ago.
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Here's the blue dyed key I had made per request. This one didnt come out as expected. The walls, being very thin, are extremely transparent compared to the thicker top section. These pictures don't really portray what I'm talking about that well. In person, the walls look much lighter in color. I'll continue experimenting with it until I get the wall color the way I want it. I'm afraid doing so will make the top section look incredibly dark. Also this cast came out significantly more sticky and unfinished with very little rigidity. I got my fingerprints and excess resin embedded all over the surfaces (advice: never do anything with this stuff without gloves on. It's a PITA washing resin off.) I gave it ample time to cure - 24 hours. My hypothesis at the moment is that it may be due to the dye that I have chosen. It's probably a water based dye which would probably soften up the plastic if mixed in. I'll be experimenting with the dye with different types of resins to test it. I'll be disappointed if it turns out I'll have to use a dye specifically made for these plastic resins. The sparkly powder I've added to a previous key seems to have no effect on the cure.
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Oh yea, and I've started my next cast which uses pearlescent white sparkling powder. I used it in much less concentration than the blue powder. While mixing it up, I couldn't help but notice it looked a lot like shiny semen. Sorry I had to share that, but the resemblance was uncanny.