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To anyone reading this, I did some research on Etsy (interviews with users doing resin casting) and got a lot of good information. If anyone would like a copy of the info I collected (on sculpting, casting, painting, etc.), send me a private message.
Plaster casting is easy.
You need will need to do some reading on how to make rubber molds, but the info is readily available, and the investment compounds aren't expensive. One mold, if care is taken, will make a lot of plaster reproductions.
Casting in other materials depends on the need of heat or not. Anything that requires heating, like aluminum or other metals, requires more materials and a more complicated molding process. Many plastic resins give off heat as they cure, so they may also need all the stuff needed for metal casting.
A lot depends on how large or small your pieces are. Very large work is usually molded in sections then joined afterward, and small work might require a vacuum pump or a centrifuge to capture all the fine details. Both force the investment onto the surface of the original by sucking out all the air in the investment, or by using centrifugal force.
A piece that's about 4-6 inches high or so would be a less fussy size than one that was 2 feet or more, or one that's only 2 inches or less.
Good luck! It isn't hard, but expect to mess up a time or two at first.
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