Step 10: It's Getting Hot in Here..
Put half a pan of water on the stove and bring it to the boil.
Place the glass mixing bowl onto the pan and turn the heat down to a light boil.
Put the Van Aken clay into the glass bowl and allow it to heat up until it is liquid and runny (stir regularly).
Make sure it is fully liquid before trying to pour it into the molds' holes.
Do the pour quickly, clay cools fast and you don't want an incomplete mold pour.
Oddly enough, the clay color used for Gromit doesn't melt as well as other colors, so you may need to add a tiny bit of mineral oil to the clay while it is melting to make it more liquid.
Be careful though, the more oil you add the softer the clay will become. Make it too soft and you won't be able to animate it later.
You can use a double boiler instead of the pan/bowl arrangement, but the results are the same.
Do not try and melt the clay in a fry pan or on direct heat, burnt clay is toxic and useless for animating.