Using copydex instead of liquid laytex for making molds.

Question

can you use copydex glue instead of liquid laytex for making moulds?

Answer 1

It's not good enough.

What kind of mould are you thinking about?

For taking a casting you might use alginate (and organic compound used by dentists for casts mouths. Then use plaster to make your actual mould of that.

Latex is not too durable either and is in danger of warping. But for one off/ small runs, it is Ok for small pieces.

Large scale pieces may need an inner and outer mould. Silicone / polyeurathane supported by a plaster or fiberglass casing.

There are so many kings of moulds for different results I need more info to be more specific. Size, detail required, material being cast, etc..

Answer 2

I would doubt it.

Wouldn't Copydex be more expensive?

I've tried using Copydex before, when I ran out of liquid latex, for making some props (admittedly, not molds), and it was dreadful. Copydex isn't pure latex, it has other stuff in it.

No, if I was you I wouldn't even think of using it for molds. A simple (and cheaper) brand of latex would be much better.

Answer 3

No - you will have great difficulty getting off the former, and it tends to stretch all over the show. It is pretty disgusting stuff to work with. It may be easier to do rigid moulds (eg plaster) if you can plan where the joins are, so as to avoid any undercuts.