Hydrocal Mold Making

Hi Harry, making molds does take some time and patients. The problem becomes if you would like to make aa unique building or copy one. For making multiple parts like retaining walls a mold makes sense. However, for a one off, I would look at scratch building from an existing model.like a DPM kit or amertowne kit.
Have you looked at Downtown Deco models? They have really cool buildings that fit a small footprint

I'm looking to produce several dozen copies, but I won't be making a direct copy of anything existing - that would be unethical. I'm thinking of producing a structure in quantities of a few dozen for sale - but probably not as kits.

Ah, understood,  I would start gathering some pictures of what you would like to make. Do you have a type of building in mind?

I found this building in Brighton, Mi. I was thinking about making a molded injection tool

I made a mold with some Silicon caulk that you can pick-up at any home/hardware store, and some scrap wood.  I believe this mold took 4 tubes of caulk.  Be sure and coat the wood with Vaseline and have it sit in the sun to help speed up the drying.  I did it in the Fall so it took a good week to dry.

 

 

Here are 3 and a half copies that I pieced together to make a retaining wall.

 

 

Dan --

Smooth-On makes some nice products:

 

http://www.smooth-on.com/

 

If you decide to try it yourself, I'd look to them first.  You may have a distributor in your area.  Seems like every month they come out with a new product for making molds and/or parts.