On some forums I regularly see members who are curious about learning to sculpt and the materials needed, particularly epoxy putty. Having had some experience with different types of putty, I usually pipe up, and usually with the same long description; so I decided to post it all here
In this I’ll only deal with putties I have first-hand experience of, so this review is basically a compilation of rough notes for a more comprehensive guide. Also, there may someday be reviews on polymer clays and a proper sculpting tutorial, although there’s plenty of help available for the latter anyway. Please see the links at the end.
I’ve separated the different putties into two basic categories: elastic putties and epoxy clays. These are my own definitions, based on their cured and uncured states. Elastic putties have a texture that is something like chewed gum or sticky tack, and stretch to an extent when uncured. They cure to a slight flexible, rubber/plastic-like state. Epoxy clay is appropriate as the putties in this category act a lot like clay; more so than elastic putties, at least. They're water-soluble to some degree, and cure rock-hard. They're also usually cheaper by weight.
Lastly, before we start: if you’re a lucky git, like me, you shouldn’t have any problems handling putty (although I wash my hands well after using it). However, some people can have skin reactions after handling certain putties, making the use of gloves necessary while handling it or even preventing the use of said putty. Which type provokes a reaction in which person is largely pot luck; but those with a history of sensitive skin should be cautious.