I need some help with a reverse mould. I've tried several times using different substances, but it's never workedout. I want something cheap, and that dries fast. I need the reverse mould to hold more akward moulds for example small sections of walls. The last one I tried took a fair amount of time to dry.

Thanks In Advance
Drum

Try this link.
http://www.hirstarts.com/moldmake/moldmaking.html

I do not know if your plain will be cost effective unless you are going to make lots and lots.

Mr. Hirst wrote.

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"the same as a duck you must be made of wood"

It's ok I've found a system that works and is very cheap + quick

Which is?

I just got a small wooden base, placed the mould on it & screwed wood just against the mould. So it cost me nothing, because it was just wood lying around, and a lot faster than plaster of anything like that.