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Having neglected to take pictures at good times of the last few stages of the female firewarrior project, I had decided to not even mention them on the blog. I'm regretting that as now I have to play catch-up. I finished up the initial scuplt and made a mold of it. Which took three or four days (most of which was spent waiting on silicone to cure). Then a handful of casts. This is the stage where I learn a lot about my sculpt and usually where I do a lot of revising on it. The image at the start of this post is the mold of the first cast.
As usual, I decided I didn't like a large chunk of it and using one of the cast pieces as the base, chopped off large chunks of it and redid them. I tried getting some pictures of the new scuplt, but it kept ending up with greenstuff work on a white blob. The lighting was just unable to pick up any definition on the unpainted white resin.
So instead as I mention casting relatively regularly, so I figured people might be interested in my particular methods. I use 2 different methods depending on if I'm making a one part or two part mold. I'll plobably cover one part molds later, but as I need to cast the reworked FWF torso I'll start there. I build an interlocking brick box (I think these ones are megablocks) and then roll out a blob of clay.
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I press the part in the clay, press the building brick box around the part, and lastly add some divets using the 'wrong' end of a paintbrush to work as keys. I would use some other method besides clay, but I'm poor and haven't gotten around to hunting down and pricing out some of the temporary mold materials.
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The silicone I'm currently using is made by GE Silicones and is "RTV426" with catalyst "Beta 26". I got a 5 gallon pail of it as a sample from them a while back. I'm assuming they're used to dealing with people that use multiple gallons per cast as that's a LOT of silicone. Their datasheet suggests 3 different mixes, and I aim for the 100 parts silicone to 3 parts catalyst as I almost always add too much catalyst (bringing making the actual ratio about 100 to 4) which is halfway between 2 of the suggested ratios. I mix it up and drizzle a tiny dab onto the part which I carefully spread into the cracks of the model (sorry, forgot to snap a picture at this stage) before slowly filling the mold with the rest of the silicone. This helps us poor mold makers without vacuum chambers avoid bubbles.
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It then sits for 24 hours to cure. And that's the first half of the 2 part mold. I'll cover the second part as i do it.