Good resin/silicone for casting claws and teeth

Hi all, just wanting a couple of other opinions.

I'm looking into resins and silicones for casting claws/making molds, etc.

I live in the UK and don't want to have to pay a ton for the shipping/customs.

I've found this: http://www.ebay.co.uk/itm/Polycraft-SG2000-1kg-Fast-Cast-Polyurethane-Liquid-Plastic-Casting-Resin-Kit-/230989620801?pt=UK_Crafts_Other_Crafts_EH&hash=item35c80de641

And this: http://www.ebay.co.uk/itm/Polycraft-GP-3481-F-RTV-Silicone-Mould-Mold-Making-Rubber-Kit-Shore-A27-/221175561830?pt=UK_Crafts_Other_Crafts_EH&var=&hash=item337f173e66

Are they any good?


I'm also wondering how much silicone I'd need to make a casting for a toony set of teeth (so say four teeth) and a set of handpaw claws (10) and possibly feetpaw claws (8). What do you all think?

Thanks a lot :)