Resin Bottle Caps

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Help!

I'd love to start making those cute bottle caps (and eventually charms) with resin and pictures/glitter etc, but I read the memories and I still don't know what to do.

If someone could give me a general shopping list of the supplies I need for filling them, I'd owe them one!

Also, what's the best way to cut the circles to go in the caps?

Thank you, thank you, thank you!!