Thank you so much for your reply. I tested three different kinds of wax, playing around with the initial heat temp and I have to tell you, I'm sold on the lower temp. 1 batch I heated to the higher temp, the others I only went to 175 - 180 and what a difference. The batches with the lower temp all look really good, smooth tops little shrinkage ... nice. The other one isn't so nice. Wow, who'd a thought just a small adjustment would make such a big difference! By the way, these waxes are veggie blends and 1 was paraffin/soy blend.