How do I preserve a butterfly?

Sherri
by Sherri

I want to make a coaster of paper weight with the butterfly in the middle of it. I know I need to pour something and let it harden. Then lay butterfly on it and cover it with the remaining product. I got some epoxy but was told not to use that, plus it would be really expensive. Someone suggested Polyurethane but said it would take forever to dry. Also what do I use as a form. Someone said plastic container would not stick to it. All knowledge is appreciated.

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