adywan said:

yoda1138 said:

Adywan, just on the offchance you may not have molded plasticine with Silicone rubber before, use plenty of layers of protective clearcoat first as plasticine contains sulphur and stops silicone curing making a right ol mess! I usually sculpt from Chavant or brown terracotta wax which is very soft and meltable. no release agent needed for these. I buy mine from http://www.tiranti.co.uk/

You most likely already know all this, but that 1% chance you didn't coulda been expensive mistake.

Thanks for the info. I actually didn't realise that plasticine was still made with sulphur. Damn. I'm pretty sure that the silicon i have is tin cure and not platinum so i should be ok ( fingers crossed). But i'll do some tests first anyway

I'm not contradicting what Yoda1138 is suggesting - but I've used plastacine alot with silicones in the past (two part mould making and such) and we've had no such issues - but I guess just try a few dabs first?

Tiranti are great as they are not just stockists, but generally practitioners as well so can often answer specific questions too. A warning with Tiranti Silicone though, it has no dye in the catalyst! So you can't visibly see if its mixed consistently. I don't know if you can add dye. We used to buy silicone from Propbuilder.co.uk (as the catalyst was a deep orange, the silicone came out a nice salmon colour when mixed), but they've stopped selling now sadly.:(

This youtube channel is a hive of knowledge if you haven't already tried it - https://www.youtube.com/channel/UCI4MY9vL2ecVLF4JZLRoO-Q