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Molds and Plaster Castings [message #31571] Tue, 26 July 2011 16:07 UTC Go to previous message
avatar eTraxx is currently offline eTraxx
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Registered: August 2010
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@SLK posted his results with using 3d printed parts to create molds and resin casts. That prompted me to post up my own results. I also used prints to make RTV molds and then those molds to cast plaster copies

The model is of a Coke Oven face in 1:48. It consists of two columns and a large and small arch. The base is a piece of Sintra (PVC foam board) .. everything is glued together with epoxy.
http://images109.fotki.com/v779/photos/2/1709102/9721938/600_GluedUP-vi.jpg

I made a mold box and epoxied the model to it ..
http://images17.fotki.com/v295/photos/2/1709102/9721938/600_casting_1-vi.jpg

I used Smooth On's 'oomoo 25' RTV. The only thing I would do different would be to use a brush to make sure the RTV was pushed into every crevice. Just pouring on did get 'almost' into every detail. One of the plaster castings in in the lower left
http://images115.fotki.com/v689/photos/2/1709102/9721938/600_casting_4-vi.jpg

Close up of the cast piece
http://images31.fotki.com/v1096/photos/2/1709102/9721938/600_casting_5-vi.jpg

This is a test-piece I used to experiment with coloring. Since the brick in a coke oven like this would have been hard used, grimy etc. .. I sprayed some AI (Alcohol India Ink ) wash on, let that dry and then dry-brushed some FolkArt Terra Cotta acrylic
http://images40.fotki.com/v1337/photos/2/1709102/9721938/600_casting_7-vi.jpg
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