£10-£15 for a pot of SILIGUM, a two part material like blutack that sets in 5 minutes to a rubber mould quality, flexible and easy to use.
You can get this from Hobbycraft, THE RANGE, or many Good Craft shops
Two part resin is what i use, the stuff from Halfords. Sets in 20 mins but stinks to heaven, use outside and wear a mask when sanding because the dust is highly toxic!
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