So I can bake my premo (or fimo) with the metal thing in it?? (like to make a pendant)
Or should I attach it afterwards ??
You can definitely bake metal findings in polymer clay. There may be a shiny spot created wherever the two touch, but who would ever see it?
That area of clay will get a little smoother and "slicker" though so that's another good reason to bend the shank of an eyepin, etc., a bit before sticking it into a clay dangle, etc. (that way there's a mechanical
hold of the clay on the metal shank so it can't
come out... some people instead pull the shank out after baking, then stick it back in with an instant glue, but that's not as
strong as the mechanical hold).
If you want more info about putting eyepins, U-shaped wires, etc., into polymer clay to allow them to attach to something else and/or hang, check out this page at my site:http://www.glassattic.com/polymer/pendants_cording.htm
...click on the subcategory Top Loops
You can also add connectors after baking, but it's usually easier to do it before baking.
(If you want info on putting a connector like an eyepin, head pin, or length of wire you shape yourself into loops/etc at the ends, all the way through
a pendant or other bead, look on this page as well:http://www.glassattic.com/polymer/beads-holes.htm
You can also bake lots of materials inside
polymer clay as well as on it or partially embedded in it since many of them are not affected by the low heat we use for curing polymer clay. Metals and glass, for example, are fine, and anything that's a natural material is fine too though porous ones may need to be sealed first (wood, twigs, cork, paper, paper products, terracotta, stones, etc., etc.). It's mostly plastics which can be a problem (some are okay, some aren't... some aren't okay but can be if they're buffered from excess
heat in various ways).
If you're interested, you can read more about which materials can be used and which can't, on this page:http://www.glassattic.com/polymer/covering.htm
...and more on baking clays to keep the temp exact on this page:http://www.glassattic.com/polymer/baking.htm