One of my very early experiences with miniatures was casting my own lead figures with Prince August rubber moulds (the 3 figure fantasy range). The smell of molten lead in rubber moulds, the heady toxic fumes reducing my intelligence and the sizzle of burning flesh as I accidentally touch the casting crucible. Good times. So I always enjoy casting and moulding things.
I have used the Woodland Scenics rubber rock moulds and even made some of my own moulds with Instant Mould/Oyumaru. But the ultimate endpoint was to make a silicone mould and cast something in resin. Well with a birthday just gone I splashed the cash and made it happen.
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All ready to go |
From
The Combat Company I purchased some Pinkysil silicon ($40), Easycast resin ($40) and Stoner mould release agent ($25). For the first couple of test pieces I went for a single sided/open mould. This means one side is open to the air, as compared to a single part or two part fully enclosed mould. A single sided mould is fine if one side of the object is not visible, e.g. will be glued to something else.
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Ready of the silicon pour |
The first test piece was to replicate a dead norman from Conquest games. I glued the figure to some plastic card and hot glued that into the bottom of a cut down plastic cup. The Pinkysil is a two part silicone that you mix up for a few minutes and then pour. An hour later you are ready to remove the master from the mould. That all worked pretty well.
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Where did that norman go? |
The Easycast resin is a 2 part quick set resin. You have 2 minutes of mixing/pot life and 10 minutes before you can de-mould/remove the piece. The first mix I made I mixed for 30 seconds (I was a bit gun shy of the 2 minute mix time). That wasn’t long enough. When the resin reacts the clear resin turns white (aka “blooming” as it looks like an algae bloom in fast forward). This didn’t happen. After 30 minutes I was able to get the figure out ok, but it had dried clear. Over the next few hours it dried completely. So not enough hardener had mixed in. The second time was much better as I mixed for 1 minute. Near the end of that minute I could feel the heat coming out of the resin. Within 3-4 minutes I was seeing the white bloom and by 6-7 minutes the figure was fully white.
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The bottom of the mould, with the figure removed |
In both cases the detail was as good as the original. The only issue with the mould were the feet of the figure. As these go down into the mould they trap air, so the ends of the feet are missing. So some air vents need to be added to the mould to fix that.
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Resin "bloom" underway |
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Copy vs original |
The second test I did was a nice sandstone rock I found in the garden. First I covered the rock in PVA glue so it wouldn’t come apart in the mould. I made a custom mould box from some 5mm foam card and hot glue. Hot glue is quite good for this as it seals a join water tight (being melted plastic). When in doubt, add more hot glue. Finally I wrapped the mould box in tape to help hold everything together.
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Sealed up with PVA glue |
I underestimated the amount of silicon needed so had to quickly mix up a new batch to pour into the mould box before the first lot started to cure. In the end the top of the mould is a bit thin. I then mixed up some resin (again 1 minute mixing, waiting to feel the heat of the reaction near the end of that time) and poured away. To preserve the mould I waited until the resin had cooled (approx 30mins) before removing from the mould. The detail is fabulous. Definitely going to be using this for some figure presentation in the future.
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So crisp |
So all up I’m pretty happy with the progress so far. Next up is to do a fully enclosed mould of a test figure and get the hang of cutting open the mould correctly without damaging the mould.
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Dan with a face |
On the figure front I’ve done a bit on my 75mm test figure. The face and waistcoat are probably 80% of the way there. I’m pretty happy with the face so far, especially given the low quality of the figure.