Matthias
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Posts: 1418
Gatineau/Ottawa QC, Canada
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I was keeping this a secret, but as there are other who aparently have enough time to go around melting stuff...
I have some two part silicone that is designed for casting lowish melting point metals, sold in jewelery supply places and the like. It is far too expensive for playing with sling glandes (sorry, I know slings should always take priority) but casts exquisite detail, releases cleanly, and tolerates undercuts and spiral grooves. This summer, I learned a new trick involving standard ("vinegar smell") clear silicone caulking that may be an option. This type of silicone is inexpensive, and cures on exposure to atmospheric moisture. This means that you can't cure thick sections of it in any time period not measured in months, except for the tube you accidentally leave in the caulking gun, that cures overnight...
The trick is to mix water into the silicone and then fairly quickly make your mold. Instructions I've seen call for dish soap and water, artist's acrylic paint, or sometimes plain water. You want to get as even a distribution of water in the lended silicone as possible, and the soap/acrylic medium works to make a good emulsion. I think the paint also had the benefit of showing when you had an even blend. I don't remember the recipes of hand, but I son't think you needed much water.
So you mix this stuff up, put in a yoghurt container and bury your plug. once it has set, you cut around the plug, zigzagging to "key" the mold halves together and you are good to go. Does it stand up to lead - I don't know yet, but it should be pretty close. I haven't done the research, or the test, but I'm offering the idea up to the group to see if anyone can answer those questions. Search for " cheap silicone molds" or "GE silicone molds" and you should be on your way.
Careful with molten stuff, and it bears repeating that lead and water DO NOT get along. Make sure any mold you use is bone dry.
Matthias
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