There have been some excellent posts already submitted regarding
making a flowerpot burnout kiln. I just want to add a few
suggestions. It is a smelly process, so unless you have no other
alternative try to burn outside or in your garage. It can be done
inside, on your kitchen range, but you should have the hood fan on
to assist with the exhaust of the fumes. This is a noisy nuisance,
will smell horribly,and the soot will cover your cabinets.
Be sure to elevate your flask. A small piece of firebrick (about 2
inches square) should be placed under one rim of the flask ,
tilting it slightly. Place it so the the dish side of the flask is
downwards so that the wax can flow out., You can burn out more than
one flask at a time by placing them around the disk of firebrick.
The amount of time needed for the burnout will vary depending on the
heat output of your range,and the type of wax used. If I remember
correctly I used to allow 4 hours. You can judge whether the
burnout is complete by the chalk white appearance of the investment.
Also, there should be a red glow radiating in the dish part of the
investment, and the little sprue chanels will glow sort of orange
red. Examine them in a dim light as they will not show up clearly
in a bright light.
When lining your clay flower pot with foil, put the dull side
against the pot and have the shiny side facing outward so that it
will radiate the heat toward the flask. Use plenty of foil so that
you totally cover the inside of the pot as will as bringing it
well up over the outside of the clay pot. Use heavy duty foil, or two
layers of the thiner foil. Also be sure to poke a hole in the foil
so that the bottom of the pot will be open and the fumes can excape
One important point is to select a size of flower pot that will
totally cover the heating coils of your burner thereby directing
all the heat to the inner part of the flowerpot. You don’t want the
pot to rest on the coils,but to extend out over them and rest on the
Good luck. Alma