I use a steam dewaxer...love them! I usually wait about an hour
before I put my newly invested flasks in the dewaxer...but that could
vary dep. on your investment? I mostly use 3x5.5 inch flasks, with a
lot of complicated pieces in it. I dewax it for 2-2.5 hrs. Because I
use wax web(vacuum casting) on the vacuum draw end, I have to turn in
2-3 times during that period to steam out the wax on the other end.
You will still have some wax residue even after 2 hrs..but that will
burn out in the kiln. The nicest thing with steam dewaxing is the
reduced amount of smoke/fumes, not to mention not having to clean out
the wax in a try in the kiln. When the water in the steamer cools,
you can just rip out the thin layer of wax floating on the surface of
the water in the reservoir.
I then start with a cold kiln..going right from the dewaxer to the
kiln, opening up...and go through the FULL burnout