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88.How to make the plastic molds ?(2)

Part 4 - Take the rubber off the original. Be careful! It will be inside-out. Now you can sprinkle a little talc on it and turn it inside-in. Put it into the fiberglass case you made, bolt or clamp the case closed, invert the case so that it is sitting on that big base we where talking about. Mix your concrete and fill the rapid prototype. Let it sit to cure for a couple of days. This is the test run for this plastic mold and case so you want the concrete extra hard when you do your first de-plastic mold.

Part 5 - Unbolt the case and take out your casting. Carefully take the rubber plastic mold off the casting. If you are a skilled plastic mold maker it should be right the first time! If not you need to look at any problem areas and decide what you can do to correct them.

My thought is that for a person to start into the casting business the best way is to start with a few plastic mould - no fiberglass backing needed - do a few pours and see if you want to keep at it. If you decide you do, then as your skills increase, start to think about investing in a simple latex rapid prototype. You may be able to find a used one in good shape. Try it and see if you want to do that type of casting.