Thanks for the suggestions. I do use the metal pouring pot and it splashes in the clam shell and then the wax runs down the spout. I am going to try using a pyrex measuring cup.
I have just started using the clamshell packageing for my tarts. I have a hard time getting any wax off of the plastic if I spill some. How can I pour it neatly into the clamshell? And how do I get the spilled wax off.