anyone with experience in clear resins?
I am currently making large crystal growth out of hard insulation foam and will coat them in epoxy and mold with silicone, im trying to make a lamp for my wife and I don't know what would be the best solution to make as clear as possible crystal growths, minimal bubbles or yellowing. yes, got the idea from playing destiny to much.
Reynolds Advanced Materials makes a few great clear epoxies.
EpoxAcast 690 is clear and has some UV resistance.
For the more advanced user (IE: someone with a good ventilation setup and some experience working with nastier chemicals) there is their "Crystal Clear" series which is optically clear http://www.smooth-on.com/Urethane-Plastic-a/c5_1120_1156/index.html
If you have a material that is known to yellow over time with UV exposure you can add a tiny bit of blue tint to help balance out the yellowing.
Also, I'm not sure how large your crystals will be, but if you place the molds in a pressure pot during curing it will help with clarity. The pressure does not remove the bubbles, but makes them much smaller.