Casting resin or epoxy in a mould

Hi, I am looking to do an artwork where the final product is a clear plastic resin or epoxy sculpture with various items such as plastic forks and straws inside it. I got this idea from resin flooring which has crushed up beer bottles and screws in it, and now I need some advice. Currently I am thinking that I will make the sculpture from polystyrene and make a mould out of plaster of Paris by pouring the plaster over it in a tub of some sort. Is polystyrene a suitable material to base the mould off and can resin or epoxy be cast in plaster of Paris? Also, how might I go about making 2 parts to the mould which can join together and which I can pour resin in through a hole? Regards.

sort by: active | newest | oldest

Hello casting helpers!

I would like to make a cast of this angel. The original is about 18" tall. This is a picture of it that I superimposed in this scene. I'm not sure what it will be sitting on since I'm not sure of the cemetery's requirements. Ideally, I'd like to make it look like alabaster, with varying textures of off white and translucent shades. Being that the pour will be heavy, the cast needs to be heavy duty. Also, when taking off the cast, I'd prefer not to harm the original, although that can be done if necessary. It needs to be of a material that will withstand the test of time, hence, I'm thinking that epoxy may be a good medium. If there's something like a JB Weld that is pourable, that would be great. I have installed black epoxy tops in laboratories, a very hard substance. Any suggestions you might have would be very much appreciated. I am in a time crunch, so please let me know AYSC (at your soonest convenience). Thanks so much!

Chayson gravestone.2.pic.Ps16.jpgIMG03.jpg
Heya, Although I didn't use a clear resin, this might be of use to you.. https://www.instructables.com/id/Duplicate-Toys-using-plastic-resin/
TO get a nice polished finish you have to have a nicely polished master or spend long tedious hours polishing the mould or the finished job. Polystyrene isn't going to hack it. You can do pretty well with clay as a master which you coat with shellac layers.
Why not use silicone instead of plaster of paris? There is, afterall an Instructable (video) on it.
Correction : Silicone rubber