I want to make 1-piece silicone moulds of my latest small sculptures. They're made with pure Sculpey Firm, so they've got that slightly sandy surface to them after baking. They were very smooth prior to baking, smoothed well with fingers/shapers and alcohol/paintbrush.
Because of the size of the pieces - only slightly bigger than a 2p coin - I have limited ability to sand the surfaces. I want my reproductions to be completely smooth, so I'd like to get that glassy appearance in the mould surface if possible, but I don't want to accidentally round off the edges which are intended to be sharp or eliminate fine details.
I've seen Seal Dit, but it looks a little gloopy. Is this the best thing to use, or are there better techniques using paint to fill any tiny marks and achieve a faultless, glossy mould?
Thanks for any help you can give me!