Lets say I need to add something to an airsoft gun to make it Halo-y. I tried clay, but It keeps cracking when it dries. Melting plastic over a candle and bending into shape didn't go too well either. Any idea what I should use?
Theres lots of ways to make weapons. You can't make them out of clay unless you intend on making a mold of it and re-casting it in another material. Unless of course you're going to let it air-dry for 2-3 weeks and have it fired. Like a pottery gun or something. :mrgreen:
You could make it out of cardboard and fiberglass overtop of it.
You could sculpt it in clay, make a 2 piece rubber mold of it, and then cast it in resin.
You could carve it out of wood
You could carve it out of high density foam, make a mold of it and cast it in resin.
You could carve wood forms and vacuumform ABS plastic copies...
None of these involve melting plastic with a candle.... thats just a bad idea.
Have a look at Adams tutorial on making plastic parts: