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Sandstone Mold Question [message #58136] Fri, 07 December 2012 00:16 UTC Go to next message
avatar knurlDesign  is currently offline knurlDesign
Messages: 3
Registered: January 2012
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Junior Member

Pre-pologies if this is an old question. I did my best to search. I've got a large part I'd like to eventually cast in rubber/silicone.

Because it's so big, I'm thinking of the following technique:

1.)Print master "positive" in sandstone (for economic reasons)

2.)Create mold of positive using traditional RTV molding techniques

3.)Cast part in silicone.

I fully expected destruction of the sandstone master upon de-molding which would be fine, assuming the mold is successful. I'm imagining a pretty much total disintegration at that point...just so long as it holds up until the mold cures!

My question here is mostly whether anyone would caution against sandstone as a "positive" material for reasons other than its fragility.

Texture-wise, I'm actually hoping for a somewhat rough surface in the casting, so to me sandstone offers that built in Smile

Any advice? Thanks in advance,


P.S. I'm also hoping to take advantage of the 15% off deal ending tonight, so fast answers will be much appreciated.

Re: Sandstone Mold Question [message #58315 is a reply to message #58136 ] Mon, 10 December 2012 10:27 UTC Go to previous message
avatar bartv  is currently offline bartv
Messages: 1670
Registered: December 2007
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Senior Member
Hi jrogers04,

I know some artists who actually did this with FSC, although in their case they sanded and painted the positive first (it was for a bronze casting and required a smooth finish). They actually re-used the original afterwards, so if you're careful enough it may survive!


Community Manager Europe | Shapeways

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