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Post by goriddle on Sept 21, 2004 17:58:08 GMT -5
what are some good affordable materials and to make weapon props out of, namely bludgeoning weapons. I made a few out of spray foam insulation not to long ago. I cast a some tools and got good results. some problems occurred though. I originally used crisco as a mold release. This was fine, but I did not clean it off of the prop in time and it caused the foam, to shrivel and wrinkle up. The second time, some moron told me to use cooking oil. This did not work in any way as a mold release and it also cause shirvel. PLaster wasn't too much of a problem, but I think I will use a different mold material because there was some difficulty in prying the tool from the mold. I was considering using some old moulage I have. Anyway let me know what you fellas think.
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Post by AJ on Sept 22, 2004 10:22:17 GMT -5
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Post by Mommy's Little Monster on Sept 22, 2004 11:05:17 GMT -5
i think you would bbe better suited to make latex-polyfoam props. It's basically the same principal but the latex can be painted up really nice to look like a variety of materials and the reproduction detail is better. Plus the latex looks like a solid material, with just foam you might have holes where there where air pockets, etc...
All you need to do is stipple in 5 or so layers of latex on each side of the mold. Put the two halves together and pour in your foam. there is also a certain release to use when doing this, i'm not sure what it is. It's a liquid that when dry leaves a wax like residue. Maybe some on this board will know. If not you can ask the smooth-on people or various other special effects supply houses.
As for mold matrials, silicone is ideal, but also expensive. You might try using silicone caulking from the hardware store but you will need to vaseline the item being cast. In either case you will have to create a jacket so that the silicone sits right. As for mold cement, i use ultra cal, it is much stronger than plaster but it little hard to find locally (just look up cement supply companies and ask them if they have some, if you live in a film heavy area they most certainly will).
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Post by goriddle on Sept 22, 2004 13:17:01 GMT -5
The latex would actually be a really good idea. I think I will do that, but I will very carefully fill it with the spray foam. The silicone caulk sounds like a good idea too. Never really thought of that one.
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Post by Mommy's Little Monster on Sept 23, 2004 12:17:36 GMT -5
You can, if you like, buy polyfoam from smooth-on. It's a 1:1 A:B mixing ratio and it stays liquid so it pours easily but expands quite a bit as it solidifies. I would say get a trial size (1 pint each of part a and b liquid, so it makes lots of foam) the pint kit is approx. $30 usd plus shipping. It might end up saving you some money as i know that spray foam can be quite costly and i don't think you get near the same amount. Plus it would be much easier for making large props like bats and such.
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Post by goriddle on Sept 23, 2004 14:42:21 GMT -5
You are right about the polyfoam. I buy the spray foam because it is available without a wait. I will evetually get around to using the polyfoam.
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