I will use the same castings for the seats as in the latest FR observation cars, but I think it would be wise to make some fresh moulds first.
I have a master for each of the parts which is fixed at the bottom of a styrene box.
They then get buried beneath an RTV silicone rubber which takes roughly a day to set.
It’s a very simple 10:1 ratio mix with a catalyst which is handily coloured red so you can see it’s mixed through properly.
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